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

A technology of precipitation hardening and manufacturing method, applied in the field of stainless steel materials and martensitic stainless steel, can solve the problems of sensitivity of heating temperature and holding time, increase the cost of raw materials, and expand the austenite phase region, so as to reduce the vertical and horizontal performance differences, Reasonable chemical composition ratio and the effect of improving transverse plasticity

Active Publication Date: 2012-01-11
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, the electric furnace + external refining and smelting, add Al ingot or Ti-Te alloy to the pre-reduced slag material and the reduced slag material, control the end point C at 0.02wt% after oxygen blowing, and discharge it in the AOD furnace Nb-Te alloy is added before steel, Φ510mm electrode is poured, and Φ610mm consumable ingot is remelted after consumable consumption. The smelted steel ingots are furnace-annealed, the annealing temperature is 820-860℃, the holding time is ≥10h, and the furnace is cooled to 500℃ and air-cooled. The annealed steel ingot is heated in a heating furnace, preheated at 500°C for 2.5h, and then heated to 800°C at 50°C / h for 2h, and then heated to 1200°C at 80°C / h for 3.5±0.5h. Then forging is carried out, the forging temperature is 1150°C, and the finishing temperature is 990°C. After forging, air cooling is then annealed at 650℃, holding time ≥48h, and then cooled to 550℃ at 20℃ / h.

Embodiment 2

[0054] The annealed steel ingot was preheated at 520°C for 2.5 hours, and then heated to 820°C at 45°C / h for 2 hours, and then heated to 1190°C at 70°C / h for 3 hours. Then forging is carried out, the forging temperature is 1140℃, the final rolling temperature is 1020℃, after forging, it is air cooled and then annealed at 620-680℃. The rest of the implementation is the same as in Example 1.

Embodiment 3

[0056] The annealed steel ingot was preheated at 550°C for 2.5 hours, then heated to 840°C at 50°C / h for 2 hours, and then heated to 1195°C at 75°C / h for 3.7 hours. Then forging, 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. The rest of the implementation is 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. Specifically, the present invention relates to martensitic stainless steel, and more specifically, the present invention relates to a martensitic precipitation hardening stainless steel used for engineering materials. Background technique [0002] Martensitic stainless steel is a stainless steel 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, and martensitic chromium-nickel stainless steel can be divided into ordinary martensitic chromium-nickel stainless steel and martensite Precipitation hardening stainless steel and maraging stainless steel. Martensitic precipitation hardening stainless steel has the characteristics of high strength, good toughness and excellent corrosion resistance. This type of stee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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