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Martensite precipitation hardening stainless steel for structural member and manufacturing method thereof

A precipitation hardening and manufacturing method technology, applied in the field of stainless steel materials and martensitic stainless steel, can solve the problems of heating temperature and holding time sensitivity, expanding austenite phase area, increasing raw material cost, etc., to reduce vertical and horizontal performance differences, Improve the effect of lateral plasticity and reasonable chemical composition ratio

Active Publication Date: 2009-09-23
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This steel is prone to the following problems in the production process: 1) Due to the presence of δ-ferrite in the steel, the deformation of austenite and δ-ferrite is inconsistent during hot working, which easily causes cracks on the surface. Cracking, small deformation and multiple fires must be used for forging (heating→forging→reheating, one cycle is called one fire); 2) The steel is sensitive to heating temperature and holding time
The precious metal Mo is added to these disclosed steel types, which increases the cost of raw materials, and the Ni content is too high, which is easy to expand the austenite phase region of the steel.

Method used

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  • Martensite precipitation hardening stainless steel for structural member and manufacturing method thereof
  • Martensite precipitation hardening stainless steel for structural member and manufacturing method thereof
  • Martensite precipitation hardening stainless steel for structural member and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] According to the chemical composition shown in Table 3, electric furnace + refining outside the furnace, Al ingots or Ti-Te alloys are added to the pre-reduced slag and reduced slag, the end point C is controlled at 0.02wt% after oxygen blowing, and it is released in the AOD furnace. Add Nb-Te alloy before the steel, cast Φ510mm electrode, and remelt Φ610mm self-consumable ingot through self-consumption. The smelted steel ingots are annealed in a furnace, the annealing temperature is 820-860°C, the holding time is ≥10h, the furnace is cooled to 500°C, and the furnace is air-cooled. The annealed steel ingot is heated in a heating furnace, preheated at 500°C for 2.5 hours, then raised to 800°C at 50°C / h, kept for 2 hours, then raised to 1200°C at 80°C / h, held for 3.5±0.5h. Then forging is carried out, the forging temperature is 1150°C, and the final rolling temperature is 990°C. After forging, it is air-cooled and then annealed at 650°C. The holding time is ≥48h, and the...

Embodiment 2

[0054] The annealed ingot was preheated at 520°C for 2.5 hours, then raised to 820°C at a rate of 45°C / h, kept at a temperature of 2 hours, and then raised to 1190°C at a rate of 70°C / h, and kept at a temperature of 3 hours. Then carry out forging, the forging temperature is 1140 ℃, the final rolling temperature is 1020 ℃, air cooling after forging and annealing at 620-680 ℃. All the other implementations are the same as in Example 1.

Embodiment 3

[0056] The annealed steel ingot was preheated at 550°C for 2.5 hours, then raised to 840°C at a rate of 50°C / h, kept at a temperature of 2 hours, and then raised to 1195°C at a rate of 75°C / h, and kept at a temperature of 3.7 hours. Then forging is carried out, the forging temperature is 1130°C, the final rolling temperature is 980°C, after forging, it is air-cooled and then annealed at 620-680°C. All the other implementations are the same as in Example 1.

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Abstract

The invention provides a martensite precipitation hardening stainless steel for structural member and a manufacturing method thereof. The martensite precipitation hardening stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.05 percent of C, 13.50 to 15.50 percent of Cr, 2.5 to 4.0 percent of Cu, 3.0 to 5.0 percent of Ni, 0.15 to 0.40 percent of Nb and Ta, 0.010 to 0.040 percent of N, 0.050 to 0.15 percent of V, less than or equal to 0.80 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities. The stainless steel is smelted by combining an electric furnace, AOD refining and vacuum self-consuming technology, so the stainless steel has the characteristics of high strength, good plasticity, good corrosion resistance and the like, and can meet the requirements of high-strength components such as high-pressure values, oil drill, efficient heavy-duty machinery and the like on material performance.

Description

technical field [0001] The present invention relates to stainless steel materials, in particular, the present invention relates to martensitic stainless steel, and more particularly, the present invention relates to a martensitic precipitation hardening stainless steel for engineering materials. Background technique [0002] Martensitic stainless steels are stainless steels whose properties can be adjusted by heat treatment. According to the difference of alloying elements in steel, martensitic stainless steel can be divided into martensitic chromium stainless steel and martensitic chromium-nickel stainless steel, martensitic chromium-nickel stainless steel can be divided into ordinary martensitic chromium-nickel stainless steel, martensitic Precipitation hardening and maraging stainless steels. Martensitic precipitation hardening stainless steel has the characteristics of high strength, good toughness and excellent corrosion resistance. This type of steel is widely used in...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C33/04C21D1/26
Inventor 王敏姚长贵罗辉张杉陈杰孟宪玲廖洪军周琼艳黄诺诚
Owner 宝武特种冶金有限公司
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