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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.

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