Work Item
ASTM WK9715
Revision of A1008/A1008M-05a Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardenable
Rationale
To revise the Cu limit from 0.20% to 0.25% max on the carbon grades CS, DS, DDS, EDDS, and SS.
EAF producers depend on steel scrap as a major source of iron. During the recycling process of steel scraps from post consumer products, tramp elements such as Cu, Sn, Ni, Cr, and Mo are retained in the mix and cannot be removed. Technical literature (1,2) show that the present level of Cu in shredded scrap is expected to remain at 0.25%.
At the November 2005 meeting in Dallas, data was presented showing the effect of Cu on steel strength, surface quality, and welding characteristics. The results showed the following:
- an increase of 0.05% Cu represented an increase of 0.46 ksi in the lower yield strength and 0.35% reduction in total elongation. This shows that the impact on mechanical properties is minimal
- Cu levels up to 0.25% exhibited good surface quality
- Cu concentrations up to 0.80% did not show liquid metal embrittlement during welding
The results showed no expected deterioration in steel quality and performance with the increased Cu. The findings are also supported in the Literature (3).
1. R.V. Riboud and JP. Birat, "Technological Development of Iron and Steel in European Countries"
2. JP. Birat, "A Futures Study Analysis of the Technological Evolution of the EAF By 2010"
3. C. Houpert, V. Lanteri, J.M. Jolivet, M. Guttmann, J.P. Birat (Irsid), M. Jallon, M. Confente (CREAS), "Influence of Tramp Elements in the Production of High Quality Steels Using the Scrap/Electric Arc Furnace Route
Work Item Status
Date Initiated: 12-05-2005
Technical Contact: Garly Sett
Item: 001
Ballot: A01.19 (06-01)
Status: Will Reballot Item
Item: 002
Ballot: A01.19 (08-02)
Status: Will Reballot Item