ASTM A668 Cl.E属于低中碳低合金钢,退火或正回火需保证产品的力学性能。某批ASTM A668 CL.E材质锻件化学成分要求(max)和实际成分见表1,热处理正回火后需保证最终性能值(σ0.2≥295MPa,σb≥570MPa,δ4≥22%,Ψ≥35%,AKV(0℃)≥27J),其取样部位见图1。 ASTM A668 Cl.E is a low-carbon low-alloy steel, annealed or is back to ensure the mechanical properties of the product. A group of ASTM A668 CL.E material forgings chemical composition requirements (max) and the actual composition shown in Table 1, after tempering heat treatment is required to ensure the final performance value (σ0.2 ≥ 295MPa, σb ≥ 570MPa, δ4 ≥ 22%, Ψ ≥ 35%, AKV (0 ℃) ≥27J), the sampling site shown in Figure 1.