|
Steel Grade |
Chemical composition |
|||||||||
|
C |
Si |
Mn |
P |
S |
P+S |
Cr |
Mo |
Ni |
Cu |
|
|
37Mna |
0.34～0.38 |
0.10～0.35 |
1.35～1.75 |
≤0.020 |
≤0.010 |
≤0.025 |
≤0.30 |
- |
≤0.30 |
≤0.20 |
|
30CrMoa,c |
0.26～0.33 |
0.17～0.37 |
0.40～0.70 |
≤0.020 |
≤0.010 |
≤0.025 |
0.80～1.10 |
0.15～0.25 |
≤0.30 |
≤0.20 |
|
35CrMoa |
0.32～0.40 |
0.17～0.37 |
0.40～0.70 |
≤0.020 |
≤0.010 |
≤0.025 |
0.80～1.10 |
0.15～0.25 |
≤0.30 |
≤0.20 |
|
42CrMoa,d |
0.38～0.45 |
0.17～0.37 |
0.50～0.80 |
≤0.020 |
≤0.010 |
≤0.025 |
0.90～1.20 |
0.15～0.25 |
≤0.30 |
≤0.20 |
|
30CrMnSiA |
0.28～0.34 |
0.90～1.20 |
0.80～1.10 |
≤0.020 |
≤0.020 |
≤0.030 |
0.80～1.10 |
≤0.10 |
≤0.30 |
≤0.20 |
|
34CrMo4 |
0.30～0.37 |
0.15～0.35 |
0.60～0.90 |
≤0.020 |
≤0.010 |
≤0.025 |
0.90～1.20 |
0.15～0.30 |
≤0.30 |
≤0.20 |
| a. It should satisfy V + Nb + Ti + B + Zr ≤ 0.15%.b. According to the requirements of the buyer, after negotiation between the supplier and the buyer, and with the stipulation noted in the contract, it can be specified that Al should be greater than or equal to 0.020%.c. Orders can be placed for 30CrMoE, whose chemical composition is the same as that of 30CrMo.d. Orders can be placed for 42CrMoE, whose chemical composition is the same as that of 42CrMo. | ||||||||||
|
Grade |
Recommended heat treatment regime |
Longitudinal mechanical properties |
|||||||
|
Quenching (Normalizing) |
Tempering |
tensile strength RmPa |
Lower yield strength ReLBMPa |
Elongation after fractureA% |
Impact energy absorption |
||||
|
temperature℃ |
Coolant |
temperature℃ |
Coolant |
Not less than |
Test temperature℃ |
KV2J Not less than |
|||
|
37Mn |
820-860 |
water |
550-650 |
Air |
750 |
630 |
16 |
-50 |
27 |
|
830-870 |
Air |
- |
- |
700 |
520 |
16 |
-20 |
27 |
|
|
30CrMo |
860-900 |
water、Oil |
490-590 |
water、Oil |
930 |
785 |
12 |
-50 |
27 |
|
35CrMo |
830-870 |
water、Oil |
500-600 |
water、Oil |
980 |
835 |
12 |
-50 |
27 |
|
42CrMo |
830-870 |
Oil |
510-610 |
water、Oil |
1080 |
930 |
12 |
-50 |
27 |
|
30CrMnSiA |
860-900 |
Oil |
470-570 |
water、Oil |
1080 |
885 |
10 |
Room temperature |
27 |
| a.The tensile test temperature was room temperature.b.If ReL cannot be measured,Rp0.2 can be me measured instead of ReLc.When the purchaser specifies 4130X or 30CrMoE as the grade for delivery, the reference value of mechanical properties can be based on 30CrMo.d.When the purchaser specifies 34CrMo4 grade for delivery, the mechanical properties can refer to 35CrMo.e.When the purchaser specifies 4142 or 42CrMoE grades for delivery, the reference value of mechanical properties can be based on 42CrMo. | |||||||||
|
Steel pipe manufacturing methods |
range of sizes |
Permissible Variations in Outside Diameter |
Permissible deviation of wall thickness |
|
|
Basic level PA |
advanced level PC |
|||
|
Hot Rolled |
D＜339.7 |
±1%D |
+25%Smin 0 |
+25%Smin 0 |
|
D≥339.7 |
+30%Smin 0 |
+25%Smin 0 |
||
|
Cold drawn(rolled) Ppipe |
all |
±0.75%D |
+22.5%Smin 0 |
+15%Smin 0 |