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    Carbon structural steel has moderate carbon content, has good comprehensive performance, and the properties of strength, toughness, weld ability and so on match very well and the application is the most extensive., which are mainly used in the manufacture of welded pipe and used as stock for cold rolling, etc.

    1. Detailed information

    Carbon Structural Steel

    Carbon structural steel has moderate carbon content, has good comprehensive performance, and the properties of strength, toughness, weld ability and so on match very well and the application is the most extensive., which are mainly used in the manufacture of welded pipe and used as stock for cold rolling, etc.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    Grade 
    GB/T 700

    Similar grade

    Chemical composition (%)

    ASTM 
    A283M

    JIS 
    G3101

    DIN
    10025

    C

    Mn

    Si

    Ni

    P

    S

    Cr

    DF01




    ≤0.10

    0.25-0.55

    ≤0.12


    ≤0.040

    ≤0.040


    DF02




    0.09-0.15

    0.25-0.55

    ≤0.10


    ≤0.040

    ≤0.040


    Q195

    Gr.B

    SS 300

    S185

    0.06-0.12

    0.25-0.50

    ≤0.30

    ≤0.30

    ≤0.05

    ≤0.05

    ≤0.30

    Q215A

    Gr.C

    SS 300


    0.09-0.15

    0.25-0.55

    ≤0.30

    ≤0.30

    ≤0.05

    ≤0.05

    ≤0.30

    Q235A

    Gr.D

    SS 400


    0.14-0.22

    0.30-0.65

    ≤0.30

    ≤0.30

    ≤0.05

    ≤0.05

    ≤0.30

    Q255A


    SS 400


    0.18-0.28

    0.40-0.70

    ≤0.30

    ≤0.30

    ≤0.05

    ≤0.05

    ≤0.30

    Q275A


    SS 490


    0.28-0.38

    0.50-0.80

    ≤0.35

    ≤0.30

    ≤0.05

    ≤0.05

    ≤0.30

    S235JR




    0.08-0.15

    0.40-0.80

    0.10-0.30


    ≤0.03

    ≤0.03


    Low Alloyed High Strength Structural Steel

    Low alloyed high strength structural steel has the advantages of high strength, good comprehensive performance, long lifetime, wide application scope, more economic and so on, which are mainly used in the manufacture of welded pipe, steel structure, etc.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    Grade
    GB/T 1591

    Similar grade

    Chemical composition (%)

    ASTM 
    A529M

    JIS 
    G3135

    DIN
    10025

    C

    Mn

    Si

    Nb

    V

    P

    S

    Ti

    Q295A

    Gr42

    SPFC490

    E295

    ≤0.16

    0.80-1.50

    ≤0.55

    0.015-0.060

    0.02-0.15

    0.045

    0.045

    0.02-0.20

    Q345A

    Gr50

    SPFC590

    E335

    ≤0.20

    1.00-1.60

    ≤0.55

    0.015-0.060

    0.02-0.15

    0.045

    0.045

    0.02-0.20

    Q390A


    SYKT540


    ≤0.20

    1.00-1.60

    ≤0.55

    0.015-0.060

    0.02-0.15

    ≤0.05

    ≤0.05

    0.02-0.20

    Q420A

    Gr60



    ≤0.20

    1.00-1.70

    ≤0.55

    0.015-0.060

    0.02-0.15

    ≤0.05

    ≤0.05

    0.02-0.20

    High Quality Carbon Structural Steel

    Carbon structural steel is also namely high quality carbon structural steel, which has good mechanical properties and machining performance. It is mainly used for various mechanical structures, chain, metal products and all kinds of tools, building, bridge, boiler, vessel, etc.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    Grade 
    GB/T 700

    Similar grade

    Chemical composition (%)

    Mechanical properties

    ASTM 
    A29

    JIS 
    G4051

    DIN
    10083

    C

    Mn

    Si

    Ni

    P

    S

    Cr

    Rm
    Mpa

    Rel
    Mpa

    A5
    %

    Z
    %

    HB


    10

    1010

    S10C

    GK10

    0.07-0.13

    0.35-0.65

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    335

    195

    32



    20

    1020

    S20C

    GK20

    0.17-0.23

    0.35-0.65

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    410

    245

    28



    40

    1040

    S40C

    GK40

    0.37-0.44

    0.50-0.80

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    597


    19



    45

    1045

    S45C

    GK45

    0.42-0.50

    0.50-0.80

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    600


    17



    50

    1050

    S50C

    GK50

    0.47-0.55

    0.50-0.80

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    625


    16



    60

    1060

    S60C

    GK60

    0.57-0.65

    0.50-0.80

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    675


    12



    N070D



    GK70

    0.70-0.74

    0.46-0.55

    0.15-0.30

    0.10

    0.020

    0.020

    0.10

    715


    9



    C1074




    0.69-0.80

    0.50-0.80

    0.17-0.37

    0.25

    0.030

    0.030

    0.25






    20Mn

    1022



    0.17-0.24

    0.70-1.00

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    450


    24



    40Mn

    1043

    42B

    C40

    0.37-0.44

    0.70-1.00

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    590


    17



    45Mn

    1046

    47B

    C45

    0.42-0.50

    0.70-1.00

    0.17-0.37

    0.25

    0.035

    0.035

    0.25






    65Mn

    1566



    0.62-0.70

    0.90-1.20

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    735


    9



    Alloyed Structural Steel

    Alloyed structural steel has good mechanical properties and machining property, which is mainly used for all kinds of high- hardness packing strips, blade, chain piece, cutting die, boiler tube, all kinds of automotive parts including angle adjusting device for car seats, etc.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    Grade
    GB/T 3077

    Similar grade

    Chemical composition (%)

    Mechanical properties

    ASTM 
    A29M

    JIS 
    G4106

    DIN
    10028

    C

    Mn

    Si

    Ni

    P

    S

    Cr

    Rm
    Mpa

    Rel
    Mpa

    A5
    %

    Z
    %

    HB



    20Mn2

    1524

    SMn420

    P355GH

    0.17-0.24

    1.40-1.80

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    785

    590

    10

    40

    187

    30Mn2

    1330

    SMn433

    28Mn6

    0.27-0.34

    1.40-1.80

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    785

    635

    12

    45

    207

    20CrMoD


    SCM420

    25CrMo4

    0.17-0.24

    0.40-0.70

    0.17-0.37

    0.25

    0.035

    0.035

    0.80-1.10

    885

    685

    12

    50

    197

    30CrMoD

    4130

    SCM430

    34CrMo4

    0.26-0.34

    0.40-0.70

    0.17-0.37

    0.25

    0.035

    0.035

    0.80-1.10

    930

    735

    12

    50

    229

    35CrMoD

    4137

    SCM430

    34CrMo4

    0.32-0.40

    0.40-0.70

    0.17-0.37

    0.25

    0.035

    0.035

    0.80-1.10

    980

    835

    12

    45

    229

    42CrMoA

    4140

    SCM440

    42CrMo4

    0.38-0.45

    0.60-0.80

    0.17-0.37

    0.25

    0.035

    0.035

    0.80-1.10

    1080

    930

    12

    45

    217

    16MnCr5




    0.14-0.19

    1.00-1.30

    0.35

    0.10

    0.020

    0.020

    0.80-1.10






    40Cr

    5140

    SCr440

    41Cr4

    0.37-0.44

    0.50-0.80

    0.17-0.37

    0.25

    0.030

    0.030

    0.80-1.10

    980

    785

    9

    45

    207

    20MnBD




    0.17-0.22

    0.80-1.20

    0.25

    0.25

    0.035

    0.035

    0.25






    40MnBD

    1541B


    39MnCr-B6

    0.37-0.44

    1.10-1.40

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    980

    785

    10

    45

    207

    15CrMoG




    0.12-0.18

    0.40-0.60

    0.17-0.37

    0.25

    0.035

    0.035

    0.25

    440

    295




    Spring Steel

    Spring steel mainly has good elasticity, and since it is used under the condition of the dynamic load, the main requirement to the material of manufacturing spring is to have high yield strength; it have no plastic deformation when under heavy load; it should have high fatigue strength, and has long lifetime under the frequent load; it should have enough toughness and plasticity to avoid sudden brittle fracture under the impact force.

    Spring steel is mainly used in the manufacture of all kinds of springs such as helical springs for automotive, locomotive and tractor, spring for automotive safety belt, some important springs working under high stress, and springs subject to serious wear.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    grade
    GB1222

    Similar grade

    Chemical composition (%)

    ASTM 
    A29M

    JIS 
    G4801

    DIN
    17221

    C

    Mn

    Si

    V

    Ni

    P

    S

    Cr


    50CrVD

    6150

    SUP10

    50CrV4

    0.46-0.54

    0.50-0.80

    0.17-0.37

    0.10-0.20


    ≤0.040

    ≤0.040

    0.80-1.10

    Super6




    0.58-0.64

    0.67-0.90

    1.70-1.90



    ≤0.040

    ≤0.040

    0.13-0.25

    62Si2MnA

    9260

    SUP6

    60SiCr7

    0.60-0.64

    0.70-0.90

    1.65-1.90


    ≤0.30

    ≤0.05

    ≤0.05

    ≤0.35

    Carbon Tool Steel

    Production cost of carbon tool steel is lower, and sources of raw materials are convenient; this steel is easy for cold and hot machining, and can obtain quite high hardness after heat treatment; Under the work condition not heated up to high temperature, the wear resistance is also good, thus it is widely used. It is mainly used for making blades and sawing blades with small size and simple shape, also used in textile accessories.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    Grade
    GB/T 1298

    Similar grade

    Chemical composition (%)

    Hardness

    ASTM 
    A686

    JIS 
    G4401

    DIN
    17350

    C

    Mn

    Si

    Ni

    P

    S

    Cr

    HB

    T7A


    SK7

    C70W2

    0.65-0.74

    0.40

    0.35

    0.20

    0.035

    0.03

    0.25

    207

    T8A

    T72301W1A-8

    SK5

    C80W1

    0.75-0.84

    0.40

    0.35

    0.20

    0.035

    0.03

    0.25

    207

    T10A

    T72301W1A-9

    SK4

    C105W1

    0.95-1.04

    0.40

    0.35

    0.20

    0.035

    0.03

    0.25

    223

    Cold Heading Steel

    Cold heading steel strip has excellent cold formability, mainly used in industries including automotive, shipbuilding, equipment manufacturing, electronics, electrical appliances, bicycles, tools, light steel structure, construction, etc.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    Grade
    GB/T 6478

    Similar grade

    Chemical composition (%)

    ASTM 
    A29M

    JISG

    DIN
    1654-4

    C

    Mn

    Si

    Cr

    P

    S

    ML40Cr

    5140


    37Cr4

    0.37-0.44

    0.50-0.80

    0.30

    0.80-1.10

    0.035

    0.035

    Free Cutting Steel

    Free cutting steel is a kind of alloyed steel adding a certain amount of one kind or more kinds of free cutting elements into the steel including sulphur, phosphorus, lead, calcium, selenium, tellurium and so on, to improve its cutability. This kind of steel can be machined by cutting with higher cutting speed and deeper cutting depth. Due to adding free cutting elements into steel, cutting resistant force of steel decreases, and at the same time the free cutting elements and the formed compound can work as a lubrication for the cutting tool, and crumbs are easily broken and the wear is reduced, which accordingly reduce the surface roughness of work piece and improve the service life of knives and the efficiency of production. It is mainly used for metal wares such as: garden tools, barbecue oven rack, screwdriver, key, etc.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    grade

    standard

    Chemical composition (%)

    C

    Mn

    Si

    P

    S

    SUM23HS

    Technical agreement

    ≤0.09

    1.00-1.50

    ≤0.05

    0.04-0.09


    High Weathering Structural Steel

    High weathering steel is a kind of steel into which a small amount of alloy elements are added, such as Cu, P, Cr, Ni, etc., forming the protective layer on the surface of metallic matrix to improve the plate performance of weathering resistance. It is mainly used for boiler tube, container, etc.

    The size range is (1.5~8.5)*127~315mm, and the main grades, standards and chemical composition are as follows:

    grade
    GB/T 4171

    Similar grade

    Chemical composition (%)

    Mechanical properties

    ASTM 
    A690M

    JIS 
    G3125

    DIN
    10155

    C

    Mn

    Si

    Cr

    Ni

    P

    S

    Rm
    Mpa

    Rel
    Mpa

    09CuPCrNiA

    A690M

    SPA-H

    S355JOWP

    ≤0.12

    0.20-0.50

    0.25-0.75

    0.30-1.25

    ≤0.65

    0.07-0.15

    ≤0.035

    480

    343

    Alloyed Tool Steel

    Alloyed tool steel is a kind of carbon tool steel into which alloy elements are added, including chromium, molybdenum, tungsten, vanadium and so on, to improve the hardenability, toughness, wear resistance and heat resistance. It is mainly used in the manufacture of measuring tools, blade and saw, cutting tool, shock resistant tool, cold and hot die, and some tools for special application. 

    The main grades, standards and chemical composition are as follows:

    Grade

    Standard

    Specification (mm)

    NHY01

    GB/T 1299

    (1.5~8.5)*127~315

    NS01

    NS02

    9SiCr



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