Martensitic stainless steel forge piece material with low-temperature resistance and high strength

Abstract

The invention relates to the technical field of rolled steel forging, and discloses a martensitic stainless steel forge piece material with low-temperature resistance and high strength. The material comprises chemical components in percentage by mass as follows: 0.09%-0.14% of C, 0.20%-0.40% of Si, 0.50%-0.90% of Mn, 11.80%-13.00% of Cr, 0.45%-0.60% of Ni, 0.15%-0.30% of Mo, smaller than or equalto 0.020% of P, smaller than or equal to 0.015% of S, 0.03%-0.10% of V, smaller than or equal to 0.05% of Ti, smaller than or equal to 200 ppm of nitrogen content of gas element and the balance Fe andresidual elements. Compared with the prior art, excellent toughness and low-temperature resistance are achieved by addition of a small amount of Ni, and by addition of a smaller amount of Mo and proper control for a range of the alloy components including V, Ti and the like, the material strength is improved and stabilized, and mechanical properties of the material are enabled to meet the requirements as follows: tensile strength is higher than or equal to 690 MPa, yield strength is higher than or equal to 552 MPa, tensile elongation is higher than or equal to 18%, reduction of cross sectional area is higher than or equal to 35%, and an impact value AKv at the temperature of subzero 46 DEG C is larger than or equal to 30 J.

Description

technical field [0001] The invention relates to the technical field of forged steel, in particular to a low-temperature-resistant high-strength martensitic stainless steel forging material, which meets the requirements of the American Petroleum Institute API 6A and other product standards for PSL3 grade martensitic stainless steel. Background technique [0002] As the world's energy situation becomes increasingly tense, some cold regions, oil and gas fields rich in hydrogen sulfide and carbon dioxide, and offshore oil and gas fields have also entered the stage of exploitation. Oil production equipment in these environments has higher requirements for materials such as corrosion resistance, pressure resistance, and impact resistance. There is an increasing demand for such environmental oil production equipment in the market, and high-strength stainless steel forgings that are resistant to low temperature and corrosion have broad market prospects. [0003] At present, oil and ...

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Problems solved by technology

[0004] The main disadvantages of martensitic stainless steel on the market are: low-cost ordinary Cr13 series martensitic stainless steel has poor low temperature resistance, and cannot meet the requirements of low temperature resistance, corrosion resistance and high strength at the same time

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