It is mainly used to make high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipes for high pressure and above steam boiler pipes.
Mainly used for high pressure and high temperature service of boiler(Superheater tube, reheater tube, air guide tube, main steam tube for high and ultra high pressure boilers). Under the action of high temperature flue gas and water vapor, the tube will oxidize and corrode. It is required that the steel pipe has high durability, high resistance to oxidation and corrosion, and good structural stability.
Grade of high-quality carbon structural steel: 20g、20mng、25mng
Grade of alloy structural steel: 15mog、20mog、12crmog、15crmog、12cr2mog、12crmovg、12cr3movsitib, etc
Grade of rust-resistant heat-resistant steel: 1cr18ni9 1cr18ni11nb
| 牌号 |
质量 等级 |
化学成分(质量分数广小/% |
||||||||||||||
|
C |
Si |
Mn |
P |
S |
Nb |
V |
Ti |
Cr |
Ni |
Cu |
Nd |
Mo |
B |
Als" |
||
|
不大于 |
不小于 |
|||||||||||||||
| 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 | ||||||||||||||
|
1除Q345A、Q345B牌号外，钢中应至少含有细化晶粒元素Al、Nb、V、Ti中的一种，根据需要，供方可添加其中 一种或几种细化晶粒元素，最大值应符合表中规定。组合加入时，Nb+V+Ti<0.22%° * 对于 Q345、Q390、Q420 和 Q46O 牌号，Mo+Cr<0.30%o °各牌号的Cr、Ni作为残余元素时，Cr、Ni含量应各不大于0.30%；当需要加入时，其含量应符合表中规定或由 供需双方协商确定。 J如供方能保证氮元素含量符合表中规定，可不进行氮含量分析。如果钢中加入Al、Nb、V、Ti等具有固氮作用 的合金元素，氮元素含量不作限制，固氮元素含量应在质量证明书中注明. '当采用全铝时，全铝含量AIt^0.020%B
|
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|
No |
Grade |
Mechanical Property |
||||
|
|
|
Tensile |
Yield |
Extend |
Impect (J) |
Handness |
|
1 |
20G |
410- |
≥ |
24/22% |
40/27 |
— |
|
2 |
20MnG |
415- |
≥ |
22/20% |
40/27 |
— |
|
3 |
25MnG |
485- |
≥ |
20/18% |
40/27 |
— |
|
4 |
15MoG |
450- |
≥ |
22/20% |
40/27 |
— |
|
6 |
12CrMoG |
410- |
≥ |
21/19% |
40/27 |
— |
|
7 |
15CrMoG |
440- |
≥ |
21/19% |
40/27 |
— |
|
8 |
12Cr2MoG |
450- |
≥ |
22/20% |
40/27 |
— |
|
9 |
12Cr1MoVG |
470- |
≥ |
21/19% |
40/27 |
— |
|
10 |
12Cr2MoWVTiB |
540- |
≥ |
18/-% |
40/- |
— |
|
11 |
10Cr9Mo1VNbN |
≥ |
≥ |
20/16% |
40/27 |
≤ |
|
12 |
10Cr9MoW2VNbBN |
≥ |
≥ |
20/16% |
40/27 |
≤ |
In addition to ensuring chemical composition and mechanical properties, hydrostatic tests are performed one by one, and flaring and flattening tests are performed. . In addition, there are certain requirements for the microstructure, grain size, and decarburization layer of the finished steel pipe.
Supply Ability: 2000 Tons Per Month Per Grade of GB/T5310-2017 Alloy Steel Pipe
In Bundles And In Strong Wooden Box
7-14 days if in stock, 30-45 days to produce
30% depsoit, 70% L/C or B/L copy or 100% L/C at sight