The difference for SA240 310H and SA240 310S stainless steel sheet

In U.S.stainless steel specification SA240/SA240M A240/A240M,there are SA240 310H stainless steel sheet uns s31009,SA240 310S stainless steel sheet uns s31008 and SA240 310 stainless steel sheet uns s31000.

The difference for SA240 310H stainless steel sheet and SA240 310S stainless steel sheet,SA240 310H stainless steel sheet contains higher carbon (0.04-0.10%) than SA240 310S stainless steel sheet,and SA240 310H stainless steel sheet enhanced creep resistance and better in higher temperature environments than SA240 310S stainless steel sheet.
 

SA240 310S vs SA240 310H		Chemical composition: Heat Analysis  Max%
Standard	Grade	C	Mn	P	S	Si	Cr		Ni	N
ASME SA240/240M	310S	0.08	2.00	0.045	0.030	1.50	24.0-26.0		19.0-22.0
ASME SA240/240M	310H	0.04-0.10	2.00	0.045	0.030	0.75	24.0-26.0		19.0-22.0
Mechanical Properties:		UNS Designation		Yield strength		Tensile strength		Hardness max.
				Mpa  Min.		Mpa		Brinell HBW
ASME SA240/240M	310S	UNS S31008		205		515		217
ASME SA240/240M	310H	UNS S31009		205		515		217