Factory Customized China Precision Seamless Welded Steel Tube / Carbon Mild Low Alloy Steel Pipe

Overview

To meet the customers' over-expected pleasure , we've our sturdy group to offer our best overall service which incorporates advertising and marketing, product sales, designing, production, good quality managing, packing, warehousing and logistics for Seamless Welded Steel Tube / Carbon Mild Low Alloy Steel Pipe, Our intention is "blazing new floor, Passing Value", in the upcoming, we sincerely invite you to definitely improve up with us and make a shiny long term together! Our company has built stable business relationships with many well-known domestic companies as well as oversea customers. With the goal of providing high quality products and solutions to customers at low cots, we've been committed to improving its capacities in research, development, manufacturing and management. We've honored to receive recognition from our customers. Till now we've got passed ISO9001in 2005 and ISO/TS16949 in 2008. Enterprises of "quality of survival, the credibility of development" for the purpose, sincerely welcome domestic and foreign businessmen to visit to discuss cooperation.

ASTM A672 is a common high-voltage electrofusion welded pipe standard. The temperature range of the materials listed in the standard is from 20°C to -195°C. Therefore, the A672 standard is often used for low-temperature welded pipes. Among them, CC60 CL22 is a commonly used low-temperature pipe material, which is made of A516GR.60 medium and low-temperature pressure vessel carbon steel plates. It is an important material for electric welded pipes. The impact test temperature is required to be -50°C, which can be replaced by Chinese material Q345R. The chemical composition and mechanical properties of the two are similar:
CC60:
C: 0.23%; Mn: 0.55%~1.3%; Si: 0.13%~0.45%; P: 0.025% S: 0.025
Tensile strength: 415~550Mpa
Yield strength: 220Mpa
Elongation: 21%

Q345R:
C: 0.22%; Mn: 1.6%; Si: 0.55%; P: 0.025% S: 0.025
Tensile strength: 470~630Mpa
Yield strength: 345Mpa
Elongation: 21%

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

一
Q390

<0.46

一

W0.48

—

<0.49

—
Q420

<0.48

一

<0.50

<0.48

<0.52

<0,48
Q460

<0.53

<0.48

W0.55

<0.50

<0.55

W0.50
Q500

一

<0.48

一

<0.50

一

W0.50
Q550

—

<0.48

.一

<0.50

一

<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 — 一
20 —— >410 245 235 225 20 — —
25 — >450 275 265 255 18 — —
35 — >510 305 295 285 17 一 —
45 — 2590 335 325 315 14 — —
20Mn —• >450 275 265 255 20 — 一
25Mn — >490 295 285 275 18 — —
Q345 A 470—630 345 325 295 20 — 一
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

Mechanical/Chemical&Fertilizer Pipes


GB/T 8162-2008


ASTM A519-2006


BS EN 10210-1-2006


ASTM A53/A53M-2012


GB 9948-2006


GB 6479-2013


GB/T 17396-2009

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