Review Article

Metallurgical and Stress State Factors Which Affect the Creep and Fracture Behavior of 9% Cr Steels

Table 2

Chemical composition of examined Grade 91 heats with controlled additions of impurity/tramp elements P, S, Cu, Sn, and Sb [27].

CSiMnPSCuNiCrMoVNbSnSbN

A0.100.420.400.0120.0010.068.531.000.210.0800.054
P10.090.300.380.0060.0070.010.098.630.940.240.0600.0030.0040.031
P20.100.300.380.0210.0070.010.088.660.940.230.0610.0030.0040.032
P30.090.310.380.0300.0080.010.098.640.950.240.0610.0030.0040.033
S10.100.310.380.0100.0020.010.098.610.950.240.0580.0030.0040.032
S20.100.300.370.0100.0140.010.098.640.950.240.0610.0030.0040.033
S30.100.300.380.0090.0240.010.098.620.950.240.0590.0030.0040.034
Cu10.100.340.390.0080.0080.050.098.620.890.240.0620.0040.0050.031
Cu20.100.340.390.0090.0080.150.098.580.900.240.0640.0050.0050.031
Cu30.100.340.390.0080.0080.270.098.510.900.240.0630.0040.0050.034
Sn10.100.330.390.0080.0080.010.098.630.930.240.0630.0110.0050.033
Sn20.100.330.390.0090.0080.010.098.630.930.240.0630.0560.0050.033
Sn30.100.330.390.0080.0080.010.108.640.940.240.0630.1100.0050.037
Sb10.100.340.380.0090.0070.010.098.650.920.240.0560.0040.0110.032
Sb20.100.340.380.0090.0070.010.098.730.920.240.0570.0040.0530.032
Sb30.100.340.380.0090.0080.010.098.660.910.230.0560.0040.1100.034

Note: the “A” heat is the control heat and may be identified in associated figures as “P0” or “Cu0”, and so on.