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Seamless steel tubes for normal structure

Short Description:

Seamless steel tubes for structural purposes, Seamless steel tubes for mechanical structures in GB/8162-2008 Standard. material include High-quality carbon steel and low alloy steel,such as 10,20,35,45 and Q345,Q460,Q490,42CrMo,35CrMo.


  • Payment: 30% deposit, 70% L/C or B/L copy or 100% L/C at sight
  • Min.Order Quantity: 1 PC
  • Supply Ability: Annual 20000 Tons Inventory of Steel Pipe
  • Lead Time: 7-14 days if in stock, 30-45 days to produce
  • Packing: Black Vanishing, bevel and cap for every single pipe; OD below 219mm need to pack in bundle, and each bundle no exceed 2 tons.
  • Product Detail

    FAQ

    Product Tags

    Overview

    Standard: GB/8162-2008

    Grade Group: 10,20,35, 45,Q345,Q460,Q490,Q620,42CrMo,35CrMo,Etc

    Thickness: 1 - 100 mm

    Outer Diameter(Round): 10 - 1000 mm

    Length: Fixed length or random length

    Section Shape: Round

    Place of Origin: China

    Certification: ISO9001:2008

     

    Alloy Or Not: Alloy or carbon

    Application: Structural pipe, mechanical pipe

    Surface Treatment: As customer's requirement

    Technique: Hot Rolled or Cold Rolled

    Heat treatment: Annealing/Normalizing/Stress Relieving

    Special Pipe: Thick Wall Pipe

    Usage: Construction, mechanical

    Test: ECT/UT

    Application

    It Is Mainly Used To Make Carbon Structural Steel, Alloy Structural Steel and mechanical structures.

    Main Grade

    Grade Of Carbon Structural Steel: 10,20,35, 45,Q345,Q460,Q490,Q620,, Etc

    Grade Of Alloy Structural Steel: 42CrMo,35CrMo, Etc

    Chemical Component

    Steel Grade

    Quality level

    Chemical composition

    C

    Si

    Mn

    P

    S

    Nb

    V

    Ti

    Cr

    Ni

    Cu

    Nd

    Mo

    B

    Als"

    no greater than

    not less than

     Q345 A

    0.20

    0.50

    1.70

    0.035 0.035

    0.30

    0.50

    0.20

    0.012

    0.10

    ——
    B 0.035 0.035
    C 0.030 0.030

    0.07

    0.15

    0.20

      0.015

    D

    0.18

    0.030 0.025
    E 0.025 0.020
     Q390 A

    0.20

    0.50

    1.70

    0.035 0.035

    0.07

    0.20

    0.20

    0.3

    0.50

    0.20

    0.015

    0.10

    B 0.035 0.035
    C 0.030 0.030

      0,015

    D 0.030 0.025
    E 0.025 0.020
    Q42O A

    0.20

    0.50

    1.70

    0.035 0.035

    0.07

    0.2

    0.20

    0.30

    0.80

    0.20

    0.015

    0.20

    ——

    ——

    B 0.035 0.035
    C 0.030 0.030

    0.015

    D 0.030 0.025
    E 0.025 0.020
    Q46O C

    0.20

    0.60

    1.80

    0.030 0.030

    0.11

    0.20

    0.20

    0.30

    0.80

    0.20

    0.015

    0.20

    0.005

    0.015

    D 0.030 0.025
    E 0.025 0.020
    Q500 C

    0J8

    0.60

    1.80

    0.025 0.020

    0.11

    0.20

    0.20

    0.60

    0.80

    0.20

    0.015

    0.20

    0.005

    0.015

    D 0.025 0.015
    E 0.020 0.010
    Q550 C

    0.18

    0.60

    2.00

    0.025 0,020 0.11

    0.20

    0.20

    0.80

    0.80

    0.20

    0.015

    0.30

    0.005

    0.015

    D 0.025 0,015
    E 0.020 0.010
    Q62O C

    0.18

    0.60

    2.00

    0.025 0.020

    0.11

    0.20

    0.20

    1.00

    0.80

    0.20

    0.015

    0.30

    0.005

    0.015

    D 0.025 0.015
    E 0.020 0.010
     a. In addition to Q345A and Q345B grades, the steel should contain at least one of the refined grain elements Al, Nb, V, and Ti. According to the needs, the supplier can add one or more refined grain elements. The maximum value shall be as specified in the table. When combined, Nb + V + Ti is not more than 0.22%b. For Q345, Q390, Q420 and Q46O grades, Mo + Cr is not greater than 0.30%c. When Cr and Ni of each grade are used as residual elements, the content of Cr and Ni should not be greater than 0.30%; when it is necessary to add, the content should meet the requirements in the table or be determined by the supplier and the buyer through consultation.d. If the supplier can ensure that the nitrogen content meets the requirements in the table, the nitrogen content analysis may not be performed. If Al, Nb, V, Ti and other alloy elements with nitrogen fixation are added to the steel, the nitrogen content is not limited. The nitrogen fixation content should be specified in the quality certificate.

    e. When using full aluminum, the total aluminum content Alt ≥ 0020%.

    Grade

    Carbon equivalent CEV (mass fraction) /%

    Nominal wall thickness s≤ 16mm

    Nominal wall thickness S2>16 mm〜30 mm

    Nominal wall thickness S>30mm

    Hot rolled or normalized normalized

    Quenching +tempering

    Hot rolled or normalized

    Quenching +tempering

    Hot rolled or normalized

    Quenching +tempering

    Q345

    <0.45

    <0.47

    <0.48

    Q390

    <0.46

    W0.48

    <0.49

    Q420

    <0.48

    <0.50

    <0.48

    <0.52

    <0,48

    Q460

    <0.53

    <0.48

    W0.55

    <0.50

    <0.55

    W0.50

    Q500

    <0.48

    <0.50

    W0.50

    Q550

    <0.48

    .一

    <0.50

    <0.50

    Q62O

    <0.50

    <0.52

    W0.52

    Q690

    <0.50

    <0.52

    W0.52

    Mechanical Property

    Mechanical properties of high-quality carbon steel structural steel and low-alloy high-strength structural steel pipes

    Grade Quality level Yield Strength Lower yield strength Elongation after breaking Impact test
    Nominal wall thickness temperature Absorb energy
    <16 mm >16 mm〜 〉30 mm
    30 mm
    not less than not less than
    10 >335 205 195 185 24
    15 >375 225 215 205 22
    20 —— >410 245 235 225 20
    25 >450 275 265 255 18
    35 >510 305 295 285 17
    45 2590 335 325 315 14
    20Mn —• >450 275 265 255 20
    25Mn >490 295 285 275 18
    Q345 A 470—630 345 325 295 20
    B 4~20 34
    C 21 0
    D -20
    E -40 27
    Q39O A 490—650 390 370 350 18
    B 20 34
    C 19 0
    D -20
    E -40 27
    Q42O A 520〜680 420 400 380 18
    B 20 34
    C 19 0
    D -20
    E -40 27
    Q46O C 550〜720 460 440 420 17 0 34
    D -20
    E -40 27
    Q500 C 610〜770 500 480 440 17 0 55
    D -20 47
    E -40 31
    Q550 C 670〜830 550 530 490 16 0 55
    D -20 47
    E -40 31
    Q62O C 710〜880 620 590 550 15 0 55
    D -20 47
    E -40 31
    Q690 C 770〜94。 690 660 620 14 0 55
    D -20 47
    E -40 31

    Mechanical properties of alloy steel pipes

    NO Grade Recommended heat treatment regime Tensile properties Annealed or high temperature tempered steel pipe Delivery condition Brinell hardness HBW
    Quenching (normalizing) Tempering Yield StrengthMPa Tensile Strength MPa Elongation after breaking A%
    temperature Coolant Temperature Coolant
    Frirst Second not less than no greater than
    1 40Mn2 840 Water, oil 540 Water, oil 885 735 12 217
    2 45Mn2 840 Water,oil 550 Water, oil 885 735 10 217
    3 27SiMn 920 Water 450 Water, oil 980 835 12 217
    4 40MnBc 850 oil 500 Water, oil 980 785 10 207
    5 45MnBc 840 oil 500 Water, oil 1 030 835 9 217
    6 20Mn2Bc'f 880 oil 200 Water, air 980 785 10 187
    7 20CrdJ 880 800 Water,oil 200 Water, air 835 540 10 179
    785 490 10 179
    8 30Cr 860 oil 500 Water, oil 885 685 11 187
    9 35Cr 860 oil 500 Water, oil 930 735 11 207
    10 40Cr 850 oil 520 Water, oil 980 785 9 207
    11 45Cr 840 oil 520 Water, oil 1 030 835 9 217
    12 50Cr 830 oil 520 Water, oil 1 080 930 9 229
    13 38CrSi 900 oil 600 Water, oil 980 835 12 255
    14 20CrModJ 880 Water,oil 500 Water, oil 885 685 11 197
    845 635 12 197
    15 35CrMo 850 oil 550 Water, oil 980 835 12 229
    16 42CrMo 850 oil 560 Water, oil 1 080 930 12 217
    17 38CrMoAld 940 Water, oil 640 Water, oil 980 835 12 229
    930 785 14 229
    18 50CrVA 860 oil 500 Water, oil 1 275 1 130 10 255
    19 2OCrMn 850 oil 200 Water、air 930 735 10 187
    20 20CrMnSif 880 oil 480 Water, oil 785 635 12 207
    21 3OCrMnSif 880 oil 520 Water, oil 1 080 885 8 229
    980 835 10 229
    22 35CrMnSiA£ 880 oil 230 Water、air 1 620 9 229
    23 20CrMnTie-f 880 870 oil 200 Water、air 1 080 835 10 217
    24 30CrMnTie*f 880 850 oil 200 Water、air 1 470 9 229
    25 12CrNi2 860 780 Water,oil 200 Water、air 785 590 12 207
    26 12CrNi3 860 780 oil 200 Water、air 930 685 11 217
    27 12Cr2Ni4 860 780 oil 200 Water、air 1 080 835 10 269
    28 40CrNiMoA 850 —— oil 600 Water、air 980 835 12 269
    29 45CrNiMoVA 860 oil 460 oil 1 470 1 325 7 269
    a. Allowable adjustment range of heat treatment temperature listed in the table: quenching ± 15 ℃, low temperature tempering ± 20 ℃, high temperature tempering soil 50 ℃.b. In the tensile test, transverse or longitudinal samples can be taken. In case of disagreement, the longitudinal sample is used as the basis for arbitration.c. Boron-containing steel can be normalized before quenching, and the normalizing temperature should not be higher than its quenching temperature.

    d. Delivery according to a set of data specified by the demander. When the demander has not specified, delivery can be made according to any of the data.

    e. The first quenching of titanium steel with Ming Meng can be replaced by normalizing.

    f. Isothermal quenching at 280 C ~320 C.

    g. In the tensile test, if Rel cannot be measured, Rp0.2 can be measured instead of Rel.

     

    Test Requirement

    Chemical composition:

    Stretch,Hardness,Shock,Squash,Bending,Ultrasonic testing,Eddy current,detection,Leak detection,Galvanized

    Product Detail


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