双相不锈钢的种类及化学成分
表1给出了第二代锻造双相不锈钢管的铸造双相不锈钢的化学成分，为便于比较，第一代双相不锈钢和通常奥氏体不锈钢也包括在其中。
表1 锻造和铸造双相不锈钢管及奥氏体不锈钢管的化学成分（%）
| 名称 |
UNS No. |
EN |
C |
Cr |
Ni |
Mo |
N |
Cu |
W |
| 锻造双相不锈钢 |
| 第一代双相不锈钢 |
| 329 |
S32900 |
1.4460 |
0.08 |
23.0-28.0 |
2.5-5.0 |
1.0-2.0 |
** |
― |
― |
| 3RE60*** |
S31500 |
1.4417 |
0.030 |
18.0-19.0 |
4.3-5.2 |
2.50-3.00 |
0.05-0.1 |
― |
― |
| Uranus 50 |
S32404 |
|
0.04 |
20.5-22.5 |
5.5-8.5 |
2.0-3.0 |
― |
1.00-2.00 |
― |
| 第二次双相不锈钢 |
| 2304 |
S32304 |
1.4362 |
0.030 |
21.5-24.5 |
3.0-5.5 |
1.05-0.60 |
0.05-0.20 |
― |
― |
| 2205不锈钢管 |
S31803 |
1.4462 |
0.030 |
21.0-23.0 |
4.5-6.5 |
2.5-3.5 |
0.08-0.20 |
― |
― |
| 2205不锈钢管 |
S32205 |
1.4462 |
0.030 |
22.0-23.0 |
4.5-6.5 |
3.0-3.5 |
0.14-0.20 |
― |
― |
| DP-3 |
S31260 |
|
0.03 |
24.0-26.0 |
5.5-7.5 |
5.5-7.5 |
0.10-0.30 |
0.20-0.80 |
0.10-0.50 |
| UR 52N+ |
S32520 |
1.4507 |
0.030 |
24.0-26.0 |
5.5-8.0 |
3.0-5.0 |
0.20-0.35 |
0.50-3.00 |
― |
| 255 |
S32550 |
1.4507 |
0.04 |
24.0-27.0 |
4.5-6.5 |
2.9-3.9 |
0.10-0.25 |
1.50-2.50 |
― |
| DP-3W |
S39274 |
|
0.03 |
24.0-26.0 |
6.8-8.0 |
2.5-3.5 |
0.24-0.32 |
0.20-0.80 |
1.50-2.50 |
| 2507不锈钢管 |
S32750 |
1.4410 |
0.030 |
24.0-26.0 |
6.0-8.0 |
3.0-5.0 |
0.24-0.32 |
0.50 |
― |
| Zeron 100 |
S32760 |
1.4501 |
0.030 |
24.0-26.0 |
6.0-8.0 |
3.0-4.0 |
0.20-0.30 |
0.50-1.00 |
0.50-1.00 |
| 锻造奥氏体不锈钢 |
| 304 L |
S30403 |
1.4307 |
0.030 |
18.0-20.0 |
8.0-12.0 |
― |
0.10 |
― |
― |
| 316 L |
S31603 |
1.4404 |
0.030 |
16.0-18.0 |
10.0-14.0 |
2.0-3.0 |
0.10 |
― |
― |
| 317 L |
S31703 |
1.4438 |
0.030 |
18.0-20.0 |
11.0-15.0 |
3.0-4.0 |
0.10 |
― |
― |
| 317 LMN |
S31726 |
1.4439 |
0.030 |
17.0-20.0 |
13.5-17.5 |
4.0-5.0 |
0.10-0.20 |
― |
― |
| 904 L |
N08904 |
1.4539 |
0.020 |
19.0-23.0 |
23.0-28.0 |
4.0-5.0 |
0.10 |
1.0-2.0 |
― |
| 254 SMO不锈钢管 |
S31254 |
1.4547 |
0.020 |
19.5-20.5 |
17.5-18.5 |
6.0-6.5 |
0.18-0.22 |
0.50-1.00 |
― |
| 6% Mo |
Various |
Various |
0.030 |
19.5-22.0 |
17.5-25.5 |
6.0-7.0 |
0.18-0.25 |
1.00 |
― |
| 铸造双相不锈钢 |
| CD4MCuN |
J93372 |
|
0.04 |
24.5-26.5 |
4.4-6.0 |
1.7-2.3 |
0.10-0.25 |
2.7-3.3 |
― |
| Grade 1B |
|
|
|
|
|
|
|
|
|
| CD3MN |
J92205 |
|
0.03 |
21.0-23.5 |
4.5-6.5 |
2.5-3.5 |
0.10-0.30 |
― |
― |
| Cast 2205 |
|
|
|
|
|
|
|
|
|
| Grade 4A |
|
|
|
|
|
|
|
|
|
| CE3MN |
J93404 |
1.4463 |
0.03 |
24.0-26.0 |
6.0-8.0 |
4.0-5.0 |
0.10-0.30 |
― |
― |
| Atlas 958 |
|
|
|
|
|
|
|
|
|
| Cast 2507 |
|
|
|
|
|
|
|
|
|
| Grade 5A |
|
|
|
|
|
|
|
|
|
| CD3MWCuN |
J93380 |
|
0.03 |
24.0-26.0 |
6.5-8.5 |
3.0-4.0 |
0.20-0.30 |
0.5-1.0 |
0.5-1.0 |
| Cast Zeron 100* |
|
|
|
|
|
|
|
|
|
| Grade 6A |
|
|
|
|
|
|
|
|
|
| 铸造奥氏体不锈钢 |
| CF3 |
|
|
|
|
|
|
|
|
|
| (Cast 304L) |
J92500 |
1.4306 |
0.03 |
17.0-21.0 |
8.0-12.0 |
― |
― |
― |
― |
| CF3M |
|
|
|
|
|
|
|
|
|
| (Cast 316L) |
J92800 |
1.4404 |
0.03 |
17.0-21.0 |
9.0-13.0 |
2.0-3.0 |
― |
― |
― |
* 最大值，除非指明范围或说明是最小值，重要的数据与ASTM A 751 标准一致。
* * 未指明。
* * * 这一种钢最初没有加氮，被认为是未加氮的第一代双相不锈钢。
