Low-strength martensitic stainless steel ring forging and its forging method

Abstract

The invention discloses a low strength martensitic stainless steel ring forge piece and a forging method thereof. The martensitic stainless steel is prepared from the following components in percentage by weight: less than or equal to 0.05% of C, less than or equal to 0.05% of Si, 0.50-1.00% of Mn, less than or equal to 0.030% of P, less than or equal to 0.015% of S, 12-14% of Cr, 0.30-0.70% of Mo, 4.00-4.50% of Ni, 0.020-0.040% of N, less than or equal to 0.08% of V, less than or equal to 0.03% of Nb, less than or equal to 0.03% of Ti and the balance of Fe and impurities. The forging processcomprises the following steps: firstly, carrying out drawing-out and pre-forging; and then, carrying out cold saw blanking for upsetting for three times and drawing for two times, chambering a mandrelsupporter and rolling a ring, wherein the initial forging temperature is 1160-1180 DEG C, the finish forging temperature is 900 DEG C, and the finishing temperature can be properly reduced by 30-60 DEG C. In this way, according to the low strength martensitic stainless steel ring forge piece and the forging method thereof, an X3CrNiMo13-4 / QT650 forge piece meeting the demand on standard performance is developed by optimizing the chemical components of raw materials and matching with a reasonable thermal treatment system, so that zero breakthrough of low strength and low hardness products canbe achieved by means of the material, the primary qualification pass rate of the product is 100%, and energy source waste caused by rework and repair is avoided.

Description

technical field

[0001] The invention relates to the technical field of martensitic stainless steel, in particular to a low-strength martensitic stainless steel ring forging and a forging method thereof. Background technique

[0002] Martensitic stainless steel X3CrNiMo13-4 / QT650 is European standard EN10250-4 material, strength grade QT650 is Rm: 650-830Mpa, R P0.2 ≥520Mpa, A≥15%.

[0003] Super martensitic stainless steel X3CrNiMo13-4 is widely used in energy fields such as hydropower, offshore oil, natural gas platforms, nuclear power and petrochemical industries. It is mainly used in the manufacture of core components of energy equipment. X3CrNiMo13-4 has excellent plasticity corrosion performance.

[0004] At present, there are few domestic researches on X3CrNiMo13-4, and the European standard medium strength grades QT780 and QT900 are easy to achieve, but QT650 cannot. A few days ago, our company received a batch of orders from large foreign hydropower companies, req...

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