执行标准：GB/T 20409-2006
用途：用于锅炉水冷壁、省煤器、再热器和蒸汽管道的制造
主要钢级牌号：20G、20MnG、25MnG、12CrMoG、15CrMoG
“A”型齿型内螺纹管的尺寸规格及螺纹参数
|
公称外径/mm |
螺纹根部内径/mm |
最小内径/mm |
公称壁厚/mm |
最小壁厚/mm |
螺纹头数 |
螺纹顶宽 (周向) /mm |
螺纹高度/mm |
螺纹侧边角(。) |
螺纹根部圆角半径/mm |
螺纹节距/mm |
罗纹导程/mm |
螺旋升角(。) |
螺纹顶宽（轴向）/mm |
螺纹顶部（轴向） 槽宽/mm |
|
A |
C |
E |
S |
F |
G |
I |
J |
K |
O |
M |
N |
Q |
T |
U |
|
28.6 |
15.84 |
13.39 |
6.38 |
5.8 |
4 |
4.78 |
0.85 |
55。 |
0.13~1.27 |
21.55 |
86.19 |
30。 |
8.28 |
13.27 |
|
44.5 |
33.18 |
30.34 |
5.66 |
5.1 |
6 |
1.01 |
30.08 |
180.49 |
21.80 |
|||||
|
45 |
33 |
30.20 |
6 |
5.4 |
6 |
1.01 |
30 |
180 |
21.70 |
|||||
|
50.8 |
37.92 |
34.93 |
6.44 |
5.8 |
8 |
1.06 |
25.79 |
206.29 |
17.51 |
|||||
|
51 |
38.35 |
35.35 |
6.33 |
5.7 |
8 |
1.10 |
26.10 |
208.80 |
17.80 |
|||||
|
60 |
46 |
42.92 |
7 |
6.3 |
8 |
1.10 |
31.30 |
250.40 |
23 |
|||||
|
60 |
44 |
41 |
8 |
7.2 |
8 |
1.10 |
30 |
240 |
21.70 |
|||||
|
60.3 |
43.4 |
40.32 |
8.33 |
7.5 |
8 |
1.12 |
29.52 |
236.16 |
21.24 |
|||||
|
60.3 |
42.3 |
39.10 |
9 |
8.1 |
8 |
1.12 |
28.76 |
230.10 |
20.49 |
|||||
|
60.3 |
31.44 |
28.55 |
14.43 |
13 |
8 |
1.02 |
21.38 |
171.07 |
13.11 |
|||||
|
63.5 |
48.8 |
45.64 |
7.33 |
6.6 |
8 |
1.16 |
33.19 |
265.54 |
24.91 |
|||||
|
63.5 |
48.5 |
45.30 |
7.50 |
6.7 |
8 |
1.16 |
33 |
264 |
24.70 |
|||||
|
63.5 |
47.72 |
44.53 |
7.89 |
7.1 |
8 |
1.17 |
32.49 |
259.89 |
24.21 |
|||||
|
63.5 |
47.52 |
44.29 |
7.99 |
7.2 |
8 |
1.15 |
32.31 |
258.51 |
24.03 |
|||||
|
63.5 |
39.24 |
36.19 |
12.13 |
10.9 |
8 |
1.07 |
26.70 |
213.49 |
18.42 |
|||||
|
63.5 |
39.09 |
36.10 |
12.21 |
11 |
8 |
1.04 |
26.59 |
212.70 |
18.31 |
|||||
|
63.5 |
35.30 |
32.32 |
14.10 |
12.7 |
8 |
1.04 |
24 |
192 |
15.72 |
|||||
|
63.5 |
34.64 |
31.66 |
14.43 |
13 |
8 |
1.04 |
23.56 |
188.49 |
15.28 |
|||||
|
69.8 |
37.77 |
34.72 |
16.04 |
14.4 |
8 |
1.07 |
25.68 |
205.46 |
17.40 |
|||||
|
70 |
50 |
46.72 |
10 |
9 |
8 |
1.20 |
34 |
272 |
25.72 |
|||||
|
70 |
52 |
48.70 |
9 |
8.1 |
8 |
1.20 |
35.37 |
282.95 |
21.09 |
|||||
|
76.2 |
39.55 |
36.47 |
18.33 |
16.5 |
8 |
1.07 |
26.99 |
215.19 |
18.62 |
“B”型齿型内螺纹管的尺寸规格及螺纹参数
|
公称外径/mm |
螺纹根部内径/mm |
最小内径/mm |
公称壁厚/mm |
最小壁厚/mm |
螺纹头数 |
螺纹顶宽 (周向) /mm |
螺纹高度/mm |
螺纹侧边角(。) |
螺纹根部圆角半径/mm |
螺纹节距/mm |
罗纹导程/mm |
螺旋升角(。) |
螺纹顶宽（轴向）/mm |
螺纹顶部（轴向） 槽宽/mm |
|
B |
C |
E |
S |
F |
G |
I |
J |
K |
O |
M |
N |
Q |
T |
U |
|
35 |
20.60 |
18.10 |
7.20 |
6.5 |
6 |
3.23 |
0.95 |
50。 |
0.4~2 |
18.67 |
112 |
30。 |
5.60 |
13.07 |
|
38 |
23.60 |
20.80 |
7.20 |
6.5 |
6 |
0.99 |
21.39 |
128.20 |
15.79 |
|||||
|
38．1 |
23.23 |
20.49 |
7.44 |
6.7 |
6 |
0.99 |
21.06 |
126.40 |
15.46 |
|||||
|
60 |
45.60 |
42.20 |
7.20 |
6.5 |
12 |
1.23 |
20.70 |
247.90 |
15.10 |
|||||
|
60 |
44.50 |
41.20 |
7.75 |
7 |
12 |
1.22 |
20.18 |
242.10 |
14.56 |
|||||
|
60 |
43.40 |
40.10 |
8.30 |
7.5 |
12 |
1.21 |
19.68 |
236.15 |
14.08 |
|||||
|
66．7 |
50.70 |
- |
8 |
7.2 |
12 |
3.83 |
1.24 |
23 |
276 |
6.64 |
16.36 |
|||
|
66．7 |
49.60 |
- |
8.55 |
7.7 |
12 |
1.24 |
22.50 |
270 |
15.86 |
化学成分:
|
牌号 |
化学成分(%) |
||||||
|
C |
Mn |
Si |
Cr |
Mo |
S |
P |
|
|
20G |
0.17~0.23 |
0.35~0.65 |
0.17~0.37 |
- |
- |
≤0.020 |
≤0.025 |
|
20MnG |
0.17~0.23 |
0.70~1.00 |
0.17~0.37 |
- |
- |
≤0.020 |
≤0.025 |
|
25MnG |
0.22~0.29 |
0.70~1.00 |
0.17~0.37 |
- |
- |
≤0.020 |
≤0.025 |
|
12CrMoG |
0.08~0.15 |
0.40~0.70 |
0.17~0.37 |
0.40~0.70 |
0.40~0.55 |
≤0.020 |
≤0.025 |
|
15CrMoG |
0.12~0.18 |
0.40~0.70 |
0.17~0.37 |
0.80~1.10 |
0.40~0.55 |
≤0.020 |
≤0.025 |
|
注1： 20G、20MnG、25MnG的残余元素含量应符合：Cu≤0.20%、Cr≤0.25%、Ni≤0.25%、V≤0.08%、Mo≤0.15%；其余牌号的残余元素含量应符合：Cu≤0.20%、Ni≤0.30%。 注2： 20G钢中酸溶铝应不大于0.010%。 注3： 用氧气转加炉外精炼制造的钢，氮含量应不大于0.008%。 |
|||||||
室温纵向力学性能：
|
牌号 |
抗拉强度 Rm/ MPa(N/mm2) |
下屈服强度 R eL/ MPa(N/mm2) |
断后伸长率 A/% |
冲击功 Akv/J |
|
不小于 |
||||
|
20G |
410~550 |
245 |
24 |
35 |
|
20MnG |
≥415 |
240 |
22 |
35 |
|
25MnG |
≥485 |
275 |
20 |
35 |
|
12CrMoG |
410~560 |
205 |
21 |
35 |
|
15CrMoG |
440~640 |
235 |
21 |
35 |
生产产品：