A kind of ultra-free cutting stainless steel treated with calcium tellurium rare earth compound and preparation method thereof

Abstract

The invention relates to a super-cuttable stainless steel with calcium-tellurium rare earth compound treatment and a preparation method thereof. Every 100 parts of the stainless steel is composed of the following raw materials in parts by weight, C≤0.08 parts; Si≤1.00 parts; Mn≤2.0 parts; P≤ 0.060 part; S 0.25‑0.35 part; Ni 8.5‑10.0 part; Cr 17.0‑19.0 part; Ca 0.002‑0.008 part; Te 0.003‑0.015 part; Re 0.002‑0.012 part; : The waste stainless steel is sequentially subjected to electric arc furnace smelting, AOD refining, LF refining, continuous steel casting, billet rolling and surface treatment to obtain the stainless steel. The sulfide of the stainless steel of the present invention is uniformly dispersed, and its turning performance and mechanical properties are excellent, and at the same time, the purpose of reducing the influence of sulfide on the mechanical properties and improving the machinability is achieved; in addition, the preparation method of the present invention optimizes the smelting process, and the final stainless steel product The finished product rate can reach more than 95%, and has good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of iron and steel manufacturing, in particular to a calcium-tellurium rare-earth composite-treated ultra-free cutting stainless steel and a preparation method thereof. Background technique [0002] Stainless steel is widely used because of its excellent corrosion resistance, good plasticity and machinability. At present, it is not only used in petroleum, chemical, marine, machinery, but also in food, medical, electronics, office, etc. also occupies an important position. However, the large work hardening of stainless steel makes the machinability of stainless steel poor, resulting in low product precision and low degree of automation. The ultra-free cutting stainless steel material is especially necessary. [0003] Free-cutting stainless steel refers to stainless steel that can improve machinability by adding appropriate amount of chemical elements, thereby obtaining good machinability. According to the a...

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Problems solved by technology

Judging from the raw material ratio of the above-mentioned free-cutting steel, a small amount of calcium and rare earth has a limited effect on the spheroidization of sulfide, so that the improvement of cutting performance is not obvious

At the same time, the smelting methods of electric arc furnace, induction furnace and converter are greatly affected by scrap steel, and are not suitable for melting alloy elements, which will easily affect the yield and mechanical properties of the produced stainless steel.

[0006] In summary, the existing free-cutting stainless steels add single or combined elements of tellurium (Te), calcium (Ca), tin (Sn), and rare earth (Re) to carbon steel to achieve the purpose of spheroidizing sulfide. However, these proportioning methods cannot achieve the purpose of reducing the influence of sulfide on mechanical properties and improving machinability at the same time.

At the same time, the existing preparation methods of free-cutting stainless steel will also affect the yield and mechanical properties of stainless steel, which needs to be improved

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