High strength, hot dipped galvanized steel sheet excellent in shapeability and method of production of same

High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire

Method for producing a corrosion-resistant steel sheet

Method for heat-treating a manganese steel product and manganese steel product

HOT-ROLLED STEEL SHEET HAVING EXCELLENT DRAWABILITY AND POST-PROCESSING SURFACE HARDNESS

Austenitic Fe—Ni—Cr alloy

Cold-rolled flat steel product for deep drawing applications and method for production thereof

Method for producing an ultra high strength material with high elongation

METHOD FOR DOUBLE ALLOYING AND NANOPHASE MODIFICATION OF STEEL BY ATOMIC NITROGEN

Ferritic stainless steel sheet having excellent heat resistance

FERRITIC STAINLESS STEEL SHEET WHICH IS EXCELLENT IN WORKABILITY AND METHOD OF PRODUCTION OF SAME

Hot-rolled steel sheet

Iron powder for dust core and insulation-coated iron powder for dust core

COMPOSITE MAGNETIC MATERIAL

Clutch plate for multiplate wet clutch and method of manufacturing the same

Electric Resistance Welded Steel Pipe

WELD METAL AND WELDED STRUCTURE

Nano-pearlite rail and process for manufacturing same

Cold-rolled steel plate and method of manufacturing the same

High-strength cold-rolled steel sheet having excellent bendability

HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME (AS AMENDED)

Cold-rolled steel plate and method of manufacturing the same

HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

HOT-ROLLED STEEL SHEET FOR HIGH STRENGTH LINEPIPE HAVING TENSILE STRENGTH OF 540 MPA OR MORE

HOT-ROLLED STEEL SHEET FOR HIGH STRENGTH LINEPIPE

METHOD AND FACILITY FOR MANUFACTURING SEAMLESS STEEL PIPE WITH EXCELLENT TOUGHNESS

Method for the production of high-wear-resistance martensitic cast steel and steel with said characteristics

Manufacturing method of rare earth magnet based on heat treatment of fine powder

H-SECTION STEEL AND METHOD OF PRODUCING THE SAME

Process for manufacturing a profiled steel wire

Steel for tracked undercarriage component, and track link

Hypoeutectoid bearing steel

Hot stamping product with enhanced toughness and method for manufacturing the same

High strength steel plate and manufacturing method thereof

Cold-rolled steel plate and method of manufacturing the same

Continuous annealing device and continuous hot-dip galvanising device for steel strip

Continuous annealing device and continuous hot-dip galvanising device for steel strip

780MPa cold-rolled duel-phase strip steel and method for manufacturing the same

500 MPA grade longitudinally-welded steel pipe with low yield ratio and manufacturing method therefor

METHOD FOR THE PRODUCTION OF AN ALUMINIZED PACKAGING STEEL

Flux-cored wire, welding method using flux-cored wire, method for manufacturing weld joint using flux-cored wire, and weld joint

Method for producing a flat steel product with an amorphous, partially amorphous or fine-crystalline microstructure and flat steel product with such characteristics

MANUFACTURING METHODS OF A POWDER FOR RARE EARTH MAGNET AND THE RARE EARTH MAGNET BASED ON EVAPORATION TREATMENT

Method for producing semi-processed non-oriented electrical steel sheet having excellent magnetic properties

Forged component, method for manufacturing the same, and connecting rod

Highly corrosion-resistant, high strength, A1-containing weathering steel plate and process of manufacturing same

Ultra high obdurability steel plate having low yield ratio and process of manufacturing same

Fe-Ni-based alloy having excellent high-temperature characteristics and hydrogen embrittlement resistance characteristics, and method for producing the same

DUPLEX STAINLESS STEEL MATERIAL AND DUPLEX STAINLESS STEEL PIPE

Manufacturing method for hot press formed steel member

Steel sheet for soft-nitriding and method for manufacturing the same

Stainless steel seamless pipe for oil well use and method for manufacturing the same

High-strength hot-rolled steel strip or sheet with excellent formability and fatigue performance and a method of manufacturing said steel strip or sheet

Hot-rolled steel sheet for producing non-oriented electrical steel sheet and method of producing same

Nd—Fe—B sintered magnet and methods for manufacturing the same

Hot rolled steel sheet and method for manufacturing the same

Steel material and impact absorbing member

Grain oriented electrical steel sheet having excellent core loss, and method for manufacturing same

Manufacturing method of an alloy powder for rare earth magnet and the rare earth magnet based on heat treatment

Hot dip galvanized steel sheet

High-formability and super-strength cold-rolled steel sheet

Steel sheet for hot press-forming, hot press-formed part, and method of producing hot press-formed part

HIGH STRENGTH MULTI-PHASE STEEL, AND METHOD FOR PRODUCING A STRIP FROM SAID STEEL

Centrifugally cast hot-rolling composite roll

Method for manufacturing powder magnetic core, powder magnetic core, and coil component

Method of manufacturing grain oriented electrical steel sheet

Method for manufacturing high manganese hot-dip galvanized steel sheet with excellent coatability and ultra-high strength, and high manganese hot-dip galvanized steel sheet manufactured by said method

High-strength hot-rolled steel sheet having excellent baking hardenability and low temperature toughness with maximum tensile strength of 980 MPa or more

Austenitic TWIP stainless steel, its production and use

Galvannealed steel sheet and method of manufacturing the same

High-hardness, high-toughness, wear-resistant steel plate and manufacturing method thereof

HOT-ROLLED STEEL SHEET EXHIBITING EXCELLENT COLD FORMABILITY AND EXCELLENT SURFACE HARDNESS AFTER FORMING

Metal strip

Nonmagnetic high strength steel motor rotor support and method for manufacturing same

Cr-containing austenitic alloy and method for producing the same

Methods for making high hardness, high toughness iron-base alloys

High strength cold rolled steel sheet with low yield ratio and method of manufacturing the same

Piercing plug

Production method for grain-oriented electrical steel sheet and primary recrystallized steel sheet for production of grain-oriented electrical steel sheet

ELECTRICAL STEEL PROCESSING WITHOUT A POST COLD-ROLLING INTERMEDIATE ANNEAL

Production method for grain-oriented electrical steel sheet and primary recrystallized steel sheet for production of grain-oriented electrical steel sheet

Laser processing apparatus and laser irradiation method

Grain-oriented electrical steel sheet

Rare-earth permanent magnetic powder, bonded magnet containing thereof and device using the bonded magnet

Precipitation hardened martensitic stainless steel, manufacturing method therefor, and turbine moving blade and steam turbine using the same

Method for manufacturing galvanized steel sheet

Seamless steel pipe and method for producing same

High-strength stainless steel seamless tube or pipe for oil country tubular goods, and method of manufacturing the same

Hot-rolled steel sheet and method for producing same

High strength steel sheet having excellent cryogenic temperature toughness and low yield ratio properties, and method for manufacturing same

Method of manufacturing high strength stainless steel tube or pipe

Galvanized steel sheet for hot forming

WELD METAL WITH EXCELLENT RESISTANCE TO HYDROGEN EMBRITTLEMENT, AND SOLID WIRE FOR SUBMERGED ARC WELDING

Steel for mold, and mold

Steel sheet pile and method for manufacturing the same

STEEL MATERIAL HAVING EXCELLENT ALCOHOL-INDUCED PITTING CORROSION RESISTANCE AND ALCOHOL-INDUCED SCC RESISTANCE

Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well

Method for laser welding one or more workpieces of hardenable steel in a butt joint

IRON-NICKEL-CHROMIUM-SILICON-ALLOY

PERMANENT MAGNET AND METHOD OF PRODUCING PERMANENT MAGNET

Oriented silicon steel and method for manufacturing same

MANUFACTURING METHOD OF A POWDER FOR COMPACTING RARE EARTH MAGNET AND THE RARE EARTH MAGNET OMITTING JET MILLING PROCESS

High-strength steel sheet and method for producing the same

Stainless steel foil

High carbon steel rail with enhanced ductility

Process for producing precipitation strengthening martensitic steel

Steel sheet for soft-nitriding and method for manufacturing the same

ACID DEW POINT CORROSION-RESISTANT STEEL AND EXHAUST GAS FLOW PATH CONSTITUENT MEMBER

Steel sheet for three-piece can and method for manufacturing the same

Production method for grain-oriented electrical steel sheet

FERRITIC STAINLESS STEEL HAVING EXCELLENT HEAT RESISTANCE

Hot rolled steel sheet for square column for building structural members

High-strength spring steel wire with excellent hydrogen embrittlement resistance, manufacturing process therefor, and high-strength spring

Hollow seamless pipe for high-strength spring

Steel sheet provided with a coating offering sacrificial cathodic protection, method for the production of a part using such a sheet, and resulting part

Steel sheet for hot stamping, method of manufacturing the same, and hot stamped steel sheet member

Hot-rolled steel sheet and method for manufacturing the same

Method and Component

Non-oriented electrical steel sheet and manufacturing method thereof

Alloyed hot-dip galvanized steel sheet and method of manufacturing the same

Heat-resistant, cast ferritic steel having excellent machinability and exhaust member made thereof

Ferritic stainless steel and method for manufacturing the same

HIGH-CARBON STEEL TUBE HAVING SUPERIOR COLD WORKABILITY, MACHINABILITY, AND HARDENABILITY AND METHOD FOR MANUFACTURING THE SAME

VEHICLE COLLISION ENERGY ABSORBING MEMBER AND METHOD FOR MANUFACTURING SAME

Hot-rolled steel sheet for production of non-oriented electrical steel sheet and method of manufacturing same

Rare earth based magnet

Low-alloy duplex stainless steel having outstanding corrosion resistance and hot working properties

METHODS FOR PRODUCTION OF HIGHLY FORMABLE EXTRA DEEP DRAW ENAMELING STEEL -- PRODUCT AND PROCESS FOR MANUFACTURE THEREOF

STEEL ALLOY FOR A LOW-ALLOY HIGH-STRENGTH STEEL

MARTENSITIC STEELS WITH 1700-2200 MPA TENSILE STRENGTH

High silicon bearing dual phase steels with improved ductility

High Manganese Steel Strips with Excellent Coatability and Superior Surface Property, Coated Steel Strips Using Steel Strips and Method for Manufacturing the Steel Strips

THERMAL SPRAY COIL FOR WIRE ARC THERMAL SPRAY MACHINE

Ferritic-austenitic stainless steel

Method for producing a ring-pull top from a steel sheet provided with a protective layer and a ring-pull top produced thereby

Manufacturing method of common grain-oriented silicon steel with high magnetic induction

METHOD FOR PRODUCING MOLTEN STEEL HAVING HIGH WEAR RESISTANCE AND STEEL HAVING SAID CHARACTERISTICS

COLD-ROLLED STEEL SHEET WITH EXCELLENT SHAPE FIXABILITY AND METHOD OF MANUFACTURING THE SAME

Electric resistance welded steel pipe or steel tube having excellent HIC resistance and low-temperature toughness in electric resistance welded part, and method for manufacturing the same

High-performance NdFeB rare earth permanent magnet with composite main phase and manufacturing method thereof

Method for manufacturing heavy wall steel pipe

Method for producing a low alloy steel for oil country tubular goods having excellent sulfide stress cracking resistance

TiC-PARTICLE-REINFORCED HIGH STRENGTH AND LOW DENSITY STEEL PRODUCTS WITH IMPROVED E-MODULUS AND METHOD FOR PRODUCING SAID PRODUCT

High strength and low density particle-reinforced steel with improved E-modulus and method for producing said steel

Steel plate having yield strength of 670 to 870 N/mmand tensile strength of 780 to 940 N/mm

Ultrafine-crystalline alloy ribbon, fine-crystalline, soft-magnetic alloy ribbon, and magnetic device comprising it

Soft magnetic mixed powder

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Method for manufacturing high-performance NdFeB rare earth permanent magnetic device

Method for manufacturing NdFeB rare earth permanent magnet containing Ce

Hairspring material for mechanical timepiece and hairspring using the same

Method and steel component

Steel for induction hardening roughly shaped material for induction hardening

SILICON ALLOYED STEEL FOR HOT ROLLING

Outer-layer material for hot-rolling roll, and hot-rolling composite roll

Method for producing a galvannealed steel sheet

Non-normalized steel composition and connecting rod using the same, and method of manufacturing the connecting rod

ABRASION RESISTANT STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS AND EXCELLENT CORROSIVE WEAR RESISTANCE

HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Process for heat treatment of parts made from low and specified hardenability structural steel

Cold-rolled steel sheet and method for manufacturing same, and hot-stamp formed body

Hot-dip galvanized steel sheet and manufacturing method of the same

Abrasion resistant steel plate having excellent low-temperature toughness and excellent corrosive wear resistance

STEEL SHEET

Super non-magnetic soft stainless steel wire material having excellent cold workability and corrosion resistance, method for manufacturing same, steel wire, steel wire coil, and method for manufacturing same

Method for producing rare-earth sintered magnet, and molding machine therefor

NdFeB system sintered magnet

Electric resistance welded steel pipe

Hot rolled steel sheet and method for manufacturing the same

Production method of galvannealed steel sheet having excellent formability and exfoliation resistance after adhesion

Cold-Rolled Flat Steel Product and Method for the Production Thereof

FERRITIC STAINLESS STEEL

Machine Structural Steel Material Having Low Heat-Treatment Deformation

Ferritic lightweight high-strength steel sheet having excellent stiffness and ductility, and method of manufacturing the same

High Al-content steel sheet excellent in workability and method of production of same

High-strength electrical steel sheet and method of producing the same

Production method for rare earth permanent magnet

Production method for rare earth permanent magnet

Hot-pressed member

High-strength, high-toughness, wear-resistant steel plate and manufacturing method thereof

Rapid heating apparatus of continuous annealing line

NON-MAGNETIC HIGH MANGANESE STEEL SHEET WITH HIGH STRENGTH AND MANUFACTURING METHOD THEREOF

PREPARATION METHOD OF STEEL PRODUCT HAVING DIFFERENT STRENGTHS USING LASER HEAT TREATMENT, AND HEAT HARDENED STEEL USED THEREIN

Method for producing rare earth sintered magnet

Production method for rare earth permanent magnet

High magnetic induction oriented silicon steel and manufacturing method thereof

SOFT MAGNETIC IRON-COBALT-BASED ALLOY AND METHOD FOR THE PRODUCTION OF A SOFT MAGNETIC IRON-COBALT-BASED ALLOY

Conductive belt and electrophotographic apparatus

H-Section steel

Dual phase steel sheet and manufacturing method thereof

Cold rolled steel sheet, electrogalvanized cold-rolled steel sheet, hot-dip galvanized cold-rolled steel sheet, alloyed hot-dip galvanized cold rolled steel sheet, and manufacturing methods of the same

HIGH-STRENGTH GALVANIZED STEEL SHEET WITH EXCELLENT FORMABILITY AND SHAPE FIXABILITY AND METHOD FOR MANUFACTURING THE SAME

Hot-Rolled Flat Steel Product and Method For the Production Thereof

Thick-walled, high tensile strength steel with excellent CTOD characteristics of the weld heat-affected zone, and manufacturing method thereof

Steel for induction hardening with excellent fatigue properties

High-strength electric-resistance-welded steel pipe of excellent long-term softening resistance in intermediate temperature ranges

PROCESS FOR MANUFACTURING STEEL SHEET HAVING HIGH TENSILE STRENGTH AND DUCTILITY CHARACTERISTICS, AND SHEET THUS PRODUCED

Magnet material, permanent magnet, motor, and power generator

Fe-based metal sheet and manufacturing method thereof

FE-BASED METAL SHEET AND MANUFACTURING METHOD THEREOF

Austenitic alloy tube

Hot stamped high strength part excellent in post painting anticorrosion property and method of production of same

Martensitic Stainless Steel with High Strength, High Toughness and High Corrosion Resistance

Case hardening steel with excellent fatigue properties

Process for producing hot-rolled steel strip

Ultrahigh-strength, high-toughness, wear-resistant steel plate and manufacturing method thereof

Process for producing oxygen absorbing agent

Non-oriented electrical steel sheet being less in deterioration of iron loss property by punching

Grain-oriented electrical steel sheet for iron core and method of manufacturing the same

Method for producing grain-oriented electrical steel sheet

High-strength hot-dip galvanized steel sheet having excellent yield strength and formability

High frequency heat treatment material and method of manufacturing gear using the same

Wear resistant steel plate and manufacturing process therefor

Rare earth based magnet

THICK, HIGH-STRENGTH, SOUR-RESISTANT LINE PIPE AND METHOD FOR PRODUCING SAME

Thick-walled high-strength hot rolled steel sheet with excellent low-temperature toughness and method of producing same

High Strength Steel Alloy and Strip and Sheet Product Made Therefrom

HIGH STRENGTH HIGH DUCTILITY HIGH COPPER LOW ALLOY THIN CAST STRIP PRODUCT AND METHOD FOR MAKING THE SAME

Tool for piercing mill

HOLLOW STABILIZER, AND STEEL PIPE FOR HOLLOW STABILIZERS AND METHOD OF PRODUCING THE SAME

Method of producing grain-oriented electrical steel sheet

MANUFACTURING METHOD OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Sintered magnet

DUPLEX STAINLESS STEEL

Reduced cost steel for hydrogen technology with high resistance to hydrogen-induced embrittlement

High strength cold rolled steel sheet

Method for continuously annealing steel strip, apparatus for continuously annealing steel strip, method for manufacturing hot-dip galvanized steel strip, and apparatus for manufacturing hot-dip galvanized steel strip

AUTOMOBILE PART MANUFACTURING METHOD USING QUENCHED STEEL SHEET

Galvannealed steel sheet

Endodontic instruments and methods of manufacturing thereof

INERT ALLOY ANODE USED FOR ALUMINUM ELECTROLYSIS AND PREPARATION METHOD THEREFOR

Steel for nitrocarburizing and nitrocarburized component, and methods for producing said steel for nitrocarburizing and said nitrocarburized component

Method for producing steel material for friction welding

BASE MATERIAL FOR HIGH-TOUGHNESS CLAD STEEL PLATE AND METHOD OF PRODUCING THE CLAD STEEL PLATE

Seamless steel pipe for hollow spring

High-strength hot-rolled steel sheet and method for producing the same

Method for continuously annealing steel strip and method for manufacturing galvanized steel strip

Method of production of grain-oriented silicon steel sheet grain oriented electrical steel sheet and use thereof

R-T-B based sintered magnet

THICK-WALLED HIGH-STRENGTH SOUR-RESISTANT LINE PIPE AND METHOD FOR PRODUCING SAME

Steel, Sheet Steel Product and Process for Producing a Sheet Steel Product

High strength stainless steel seamless pipe with excellent corrosion resistance for oil well and method of manufacturing the same

Duplex stainless steel

Method for press-hardening steel

Rolled steel that hardens by means of precipitation after hot-forming and/or quenching with a tool having very high strength and ductility, and method for manufacturing same

Steel for wheel

Bearing steel material with excellent rolling fatigue property and bearing part

NI-CONTAINING STEEL PLATE

Low-density hot-or cold-rolled steel, method for implementing same and use thereof

MATERIAL OF LAVES PHASE AND FERRITIC Fe-Al PHASE

High strength cold-rolled steel sheet and manufacturing method therefor

Hot-dip galvannealed hot-rolled steel sheet and process for producing same

FERRITIC STAINLESS STEEL

Rail

Three-piece can and method of manufacturing the same

Method for manufacturing non-oriented electromagnetic steel sheet

Grain-oriented electrical steel sheet and method for improving iron loss properties thereof

PRECIPITATION HARDENING MARTENSITIC STAINLESS STEEL, TURBINE COMPONENT FORMED OF SAID MARTENSITIC STAINLESS STEEL, AND TURBINE INCLUDING SAID TURBINE COMPONENT

METHOD FOR MANUFACTURING GALVANIZED STEEL SHEET FOR HOT STAMPING, HOT-DIP GALVANNEALED STEEL SHEET FOR HOT STAMPING AND METHOD FOR MANUFACTURING SAME, AND HOT STAMPED COMPONENT

Case hardening steel material

Steel, sheet steel product and process for producing a sheet steel product

Steel sheet for electroplating, electroplated steel sheet, and methods for producing the same

High cleanliness spring steel and high cleanliness spring excellent in fatigue properties

Method of manufacturing a ferrous alloy article using powder metallurgy processing

Steel for oil country tubular goods and method of producing the same

High strength cold-rolled steel sheet exhibiting little variation in strength and ductility, and manufacturing method for same

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT BENDING WORKABILITY AND MINIMAL STRENGTH DIFFERENCE BETWEEN CENTER PART AND END PARTS IN SHEET WIDTH DIRECTION, AND METHOD FOR MANUFACTURING SAME

Surface-treated steel sheet for container having excellent processing adhesion to resin, method for manufacturing same, and can

Grain-oriented electrical steel sheet and method of manufacturing same

High carbon hot rolled steel sheet having excellent material uniformity and method for manufacturing the same

Spot welded joint

Stainless steel brake disc and method for production thereof

High strength hot-rolled steel sheet having excellent ductility, stretch flangeability and uniformity and method of manufacturing the same

Steel wire material and method for manufacturing same

HIGH STRENGTH STEEL WIRE FOR SPRING EXCELLENT IN COILING PERFORMANCE AND HYDROGEN EMBRITTLEMENT RESISTANCE AND METHOD FOR MANUFACTURING SAME

Method for manufacturing high-strength cold-rolled steel sheet with outstanding workability

HIGH-STRENGTH SEAMLESS STAINLESS STEEL TUBE FOR OIL COUNTRY TUBULAR GOODS AND METHOD OF MANUFACTURING THE SAME

Double cold reduction strip for shadow mask and process for producing the same

Automotive chassis part made from high strength formable hot rolled steel sheet

Steel material

STAINLESS STEEL ALLOY FOR GOLF CLUB HEAD

STEEL SHEET FOR HOT PRESSING USE, PRESS-FORMED PRODUCT, AND METHOD FOR MANUFACTURING PRESS-FORMED PRODUCT

High carbon hot rolled steel sheet and method for manufacturing the same

High strength steel plate having low yield ratio excellent in terms of strain ageing resistance, method of manufacturing the same and high strength welded steel pipe made of the same

HIGH-STRENGTH COLD-ROLLED STEEL SHEET, HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET, AND HIGH-STRENGTH HOT-DIP GALVANNEALED STEEL SHEET EXCELLENT IN FORMABILITY AND SHAPE FIXABILITY, AND METHODS FOR MANUFACTURING THEM

Heat-resistant, austenitic cast steel having excellent machinability and exhaust member made thereof

Magnetic body and electronic component using the same

Heat-resistant austenitic stainless steel sheet

Seamless steel pipe and method for producing the same

High-strength hot-dip galvanized steel sheet excellent in impact resistance property and manufacturing method thereof, and high-strength alloyed hot-dip galvanized steel sheet and manufacturing method thereof

High-strength thick-walled electric resistance welded steel pipe having excellent low-temperature toughness and method of manufacturing the same

STEEL FOR HOT FORMING

Process for manufacturing a recovery annealed coated steel substrate for packaging applications and a packaging steel product produced thereby

BEARING STEEL

WARM PRESS FORMING METHOD AND AUTOMOBILE FRAME COMPONENT

Method of producing austenitic iron/carbon/manganese steel sheets having a high strength and excellent toughness and being suitable for cold forming, and sheets thus produced

METHOD OF PRODUCING AUSTENITIC IRON/CARBON/MANGANESE STEEL SHEETS HAVING A HIGH STRENGTH AND EXCELLENT TOUGHNESS AND BEING SUITABLE FOR COLD FORMING AND SHEETS THUS PRODUCED

High tensile strength steel plate having excellent weld heat-affected zone low-temperature toughness and method for producing same

Steel sheet suitable for impact absorbing member and method for its manufacture