AISI410SS martensite stainless steel for valve and preparation process of AISI410SS martensite stainless steel

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to AISI410SS martensite stainless steel for a valve and a preparation process of the AISI410SS martensite stainless steel. By reasonably designing chemical components, the AISI410SS martensite stainless steel is composed of 0.10%-0.15% of C, 0.20%-0.50% of Si, 0.30%-0.60% of Mn, 11.0%-13.5% of Cr, 0-0.6% of Mo, 0.30%-0.60% of Ni, 0-0.020% of S, 0-0.020% of P, 0-0.20% of Cu, 0-0.050% of V, 0.010%-0.080% of Nb, 0-0.00016% of H, 0-0.0035% of O, and the balance Fe and impurity elements, wherein the total content of the impurity elements is smaller than or equal to 1.0%. In the smelting process, high-quality scrap steel, pig iron and sponge iron are selected as furnace charges, electric arc furnace EBT primary melting, LF refining, vacuum degassing (VD), mould casting of a steel ingot and hot charging of the steel ingot are adopted, through an oil and precision combined forging process of upsetting and drawing out of an oil press and forming of a precision forging machine, after a forge piece is subjected to overall conditioning, the strength meets the requirements that Rm is greater than or equal to 655 MPa, Rp 0.2 is greater than or equal to 517 MPa, A is greater than or equal to 18% and Z is greater than or equal to 35%, -29 DEG C impact energy averagely reaches 50 J, -46 DEG C impact energy averagely reaches 38 J, the requirement of API6A standard low temperature toughness AKv is met, the rejection rate of products is reduced, and labor efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to an AISI410SS martensitic stainless steel for valve bodies and a preparation process thereof. Background technique [0002] The valve is a control component in the fluid conveying system, which has the functions of cut-off, regulation, diversion, prevention of backflow, stabilization, diversion or overflow and pressure relief. Valves used in fluid control systems, ranging from the simplest shut-off valve to the various valves used in extremely complex automatic control systems, have a wide variety and specifications. The valve body is a main part of the valve; there are different mechanical manufacturing methods according to the pressure level. For example: casting, forging, etc. Valve bodies of medium and low pressure specifications are usually produced by casting process. The valve body of medium and high pressure specification is produced by forging process. [0003]...

AI Technical Summary

Problems solved by technology

In China, AISI4130 and AISI4140 materials can reach the level of K grade, that is, -60℃27J; AISI410 materials, there are very few material suppliers that can reach the level of P grade (-29℃, longitudinal ≥27J), and the quality is unstable, which can be stably reached L-level (-46°C, longitudinal ≥ 27J) level material suppliers are currently not available in China

Images