ASTM A841 Grade C steel plates are under technical standard ASTM A841/ A841M, which is steel plates for pressure vessel,produced by Thermo Mechanical Control Process(TMCP).
For
ASTM A841 Grade C material,unless the test temperature and absorbed energy requirements are specified in the purchase order，the test shall be conducted at -40℃ and the average absorbed energy for each set of three full size specimens shall be 20J or more.
1.1 This ASTM A841 Grade C covers steel plates produced by the thermo-mechanical control process (TMCP). The plates are intended primarily for use in welded pressure vessels.
1.2 The TMCP method consists of rolling-reduction and cooling rate controls which result in mechanical properties in the finished plate that are equivalent to those attained using conventional rolling and heat treating processes which entail reheating after rolling. A description of the ASTM A841 Grade C TMCP method is given in Appendix X1.
1.3 Due to the inherent characteristics of the TMCP method, the ASTM A841 Grade C
plates cannot be formed at elevated temperatures without sustaining significant losses in strength and toughness. The plates may be formed and post-weld heat-treated at temperatures not exceeding 1200oF [650oC], providing the requirements of 6.1 are met.
1.4 The ASTM A841 Grade C maximum nominal thickness of plates furnished under this specification may not exceed 4 in. [100 mm].
1.5 The ASTM A841 Grade C values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the ASTM A841 Grade C text, the SI units are shown in brackets. The ASTM A841 Grade C values stated in each system are not exact equivalents. Therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
ASTM A841 Grade C chemical composition:
|
Grade |
C |
Si |
Mn |
P |
S |
Cu |
|
0.10 |
0.15-0.50 |
0.70-1.60 |
0.03 |
0.015 |
≤0.35 |
|
A841 Grade C |
Ni |
Cr |
Mo |
V |
Co |
Ti |
|
≤0.25 |
≤0.25 |
≤0.08 |
≤0.06 |
≤0.06 |
0.006-0.02 |
ASTM A841 Grade C mechanical properties:
|
Grade |
Thickness mm |
Yield min (Mpa) |
Tensile Mpa |
Elongation Min % |
|
5-40 |
345 |
480-620 |
22% |
|
A841 Grade C |
40-65 |
345 |
480-620 |
22% |
|
65 |
310 |
450-585 |
22% |
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