ASTM A 1008 CS Type B
| Grade |
CS Type B |
| Corresponding standards |
ASTM A1008/A1008M-2021(a)
High strength low alloy cold rolled carbon structural steel sheet and high strength low alloy cold rolled carbon structural steel sheet with improved formability, solid solution hardening and bake hardenability
Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Required Hardness, Solution Hardened, and Bake Hardenable |
| Classify |
carbon steel |
| Label |
commercial steel |
CS Type B chemical element content (%)
Element
|
C |
Mn |
P |
S |
Cr ① |
Ni |
Cu ⓑ |
Mo |
Ti ③ |
V |
Nb ② |
| Minimum value |
0.02 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
| Maximum value |
0.15 |
0.6 |
0.025 |
0.035 |
0.15 |
0.2 |
0.2 |
0.06 |
0.025 |
0.008 |
0.008 |
① When the carbon content is less than or equal to 0.05%, the maximum allowable chromium content is 0.25% at the manufacturer's option.
②Cb=Nb
③ For steel with a carbon content of 0.02% or above, the titanium content may be allowed to be the smaller of 3.4N + 1.5S or 0.025% according to the manufacturer's choice
ⓐ There is no specified limit for Al, Si, N, and B elements, but the analysis results should be reported.
ⓑ When steel specifies copper, the copper content is the minimum value. When copper is not specified in the steel, the copper content is the maximum value.
ⓒ When the application requires aluminum deoxidized steel, it is allowed to order commercial steel (CS) with a minimum total aluminum content of 0.01%.
Note 1: Commercial Steel CS Type A and CS Type B combine chemical grades and comply with standard ASTM A568/A568M Table X2.3. (Example CS Type A 1005, CS Type B 1008)
Note 2: There is no specified type of CS chemical grade of Commercial Steel, which complies with standard ASTM A568/A568M Table X2.1. (Examples CS-1005, CS-1008, etc.)
CS Type B mechanical properties
| Product |
Yield point
σs
Mpa |
Elongation or elongation after break
δ
% |
| Thin plate |
140~275 |
≥30 |
①Applicable to various steel plate thicknesses. As the thickness of the sheet decreases, the yield strength increases, the elongation decreases, and some formability values decrease.
②The mechanical property values in the table are optional. This data is provided to assist the purchaser in specifying the appropriate steel for a particular application. These values may be exceeded.
③Yield strength and elongation are measured in the longitudinal direction according to the test methods and definitions of standard ASTM A370.
④The average plastic strain ratio (rm value) measured according to the standard ASTM E517 test method.
⑤Strain hardening index (n value) measured according to the standard ASTM E646 test method.
⑥This standard does not specify the average plastic strain rm value and the strain hardening index n value
CS Type B corresponds to different standards
1 ASTM A1011/A1011M-2018(a) Standard Specification for Hot-rolled Carbon Structural Steel, High-Strength Low Alloy Steel, Formable High-Strength Low Alloy Steel, and Ultra-High-Strength Steel Plate and Strip
2 ASTM A1008/A1008M-2021(a) High-strength low-alloy cold-rolled carbon structural steel sheet and high-strength low-alloy cold-rolled carbon structural steel sheet with improved formability, solid solution hardenability, and bake hardenability
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