| Tensile and Hardness Requirements |
| grade |
|
|
Yield Strength MPa |
Tensile Strength |
Hardness a,c |
specified Wall thickness |
Allowable Hardness Variation b |
| |
Type |
Total Elongation Under Load |
|
min MPa |
max |
|
|
| |
|
|
min |
max |
|
HRC |
HBW |
mm |
HRC |
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
| H40 |
— |
0.5 |
276 |
552 |
414 |
— |
— |
— |
— |
| J55 |
— |
0.5 |
379 |
552 |
517 |
— |
— |
— |
— |
| K55 |
— |
0.5 |
379 |
552 |
655 |
— |
— |
— |
— |
| N80 |
1 |
0.5 |
552 |
758 |
689 |
— |
— |
— |
— |
| N80 |
Q |
0.5 |
552 |
758 |
689 |
— |
— |
— |
— |
| R95 |
— |
0.5 |
655 |
758 |
724 |
— |
— |
— |
— |
| L80 L80 |
1 |
0.5 |
552 |
655 |
655 |
23 |
241 |
— |
— |
| L80 |
9Cr 13Cr |
0.5 |
552 |
655 |
655 |
23 |
241 |
— |
— |
| |
|
0.5 |
552 |
655 |
655 |
23 |
241 |
— |
— |
| C90 |
1 |
0.5 |
621 |
724 |
689 |
25.4 |
255 |
£12.70 |
3 |
| |
|
|
|
|
|
|
|
12.71 to 19.04 |
4 |
| |
|
|
|
|
|
|
|
19.05 to 25.39 |
5 |
| |
|
|
|
|
|
|
|
³ 25.40 |
6 |
| T95 |
1 |
0.5 |
655 |
758 |
724 |
25.4 |
255 |
£12.70 |
3 |
| |
|
|
|
|
|
|
|
12.71 to 19.04 |
4 |
| |
|
|
|
|
|
|
|
19.05 to 25.39 |
5 |
| |
|
|
|
|
|
|
|
³ 25.40 |
6 |
| C110 |
— |
0.7 |
758 |
828 |
793 |
30 |
286 |
£12.70 |
3 |
| |
|
|
|
|
|
|
|
12.71 to 19.04 |
4 |
| |
|
|
|
|
|
|
|
19.05 to 25.39 |
5 |
| |
|
|
|
|
|
|
|
³ 25.40 |
6 |
| P110 |
— |
0.6 |
758 |
965 |
862 |
— |
— |
— |
— |
| Q125 |
1 |
0.65 |
862 |
1034 |
931 |
b |
— |
£12.70 |
3 |
| |
|
|
|
|
|
|
|
12.71 to 19.04 19.05 |
4 |
| |
|
|
|
|
|
|
|
|
5 |
| a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. |
| b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9. |
| c For through-wall hardness tests of grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number. |
