灰口铁熔炼、浇注工艺操作规程

1.合金元素含量、力学性能和金相组织1.1元素含量和力学性能表1牌号铸件壁厚（㎜）元素含量（﹪）试样毛坯直径（㎜）最小抗拉强度（㎜）碳硅锰硫磷。HT200﹤303.2–3.51.6–2.00.6–0.9﹤0.12﹤0.123020030－503.1–3.41.5–1.80.7–0.9﹥503.0–3.31.4–1.60.8–1.0HT250﹤303.0–3.31.5–1.80.7–0.9﹤0.12﹤0.123025030﹣502.9–3.21.4–1.70.9–1.1﹥502.8–3.11.3–1.61.0–1.21.2金相组织（内控）HT200：石墨：A型石墨，长...