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Chromic-nickel-free high-strength high ductility structural steel and manufacturing method thereof

A manufacturing method and technology of structural steel, applied in temperature control, manufacturing tools, heat treatment process control, etc., can solve the problems of high price, poor machinability and poor tempering resistance of chromium-nickel carburizing steel, and achieve heat treatment process Simple, stable tempering resistance, moderate hardness effect

Inactive Publication Date: 2007-12-05
BAOSTEEL SPECIAL STEEL CO LTD
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AI Technical Summary

Problems solved by technology

Solve the defects of high price, poor machinability, low processing efficiency, and poor tempering resistance of chrome-nickel carburized steel, and better meet the requirements of needle valve body steel for diesel locomotives

Method used

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Embodiment Construction

[0043] A steel company implements the patent of this invention and smelts 26 electroslag furnace numbers. The preparation method adopts a four-step process: the first step: primary smelting in electric arc furnace→vacuum refining in ladle furnace→pouring electrode ingots; the second step: electroslag Remelting; Step 3: Rolling mill (brush mill) thermal processing and rolling into products; Step 4: Annealing of rolled products.

[0044] The first step, electric arc furnace smelting cast ingot

[0045] Using the white slag method, the molten steel is initially smelted in an electric arc furnace with a capacity of 20 to 100 tons, and the steel with basically qualified components is smelted. Harmful gases and inclusions in the steel are vacuumed and degassed; the electrode round ingot is poured, and the electrode round ingot mold is cooled for 16 to 24 hours (the cooling time is controlled according to the size of the steel ingot round ingot), and the demoulding enters the next pr...

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Abstract

The high strength and high toughness structural steel without Cr and Ni consists of C 0.24-0.30 wt%, Si 1.10-1.40 wt%, Mn 1.30-1.70 wt%, Mo 0.40-0.60 wt%, V 0.20-0.35 wt%, Al 0.015-0.050 wt%, Cu not more than 0.30 wt%, S not more than 0.012 wt%, P not more than 0.020 wt%, and Fe and inevitable impurities for the rest. Its production process includes the following steps: 1. smelting and casting ingot; 2. rolling in the heating temperature 1100-1180 deg.c, finishing temperature of 850-900 deg.c and cooling rate of 40-80 deg / hr; and 3. annealing at the temperature of 720+ / -10 deg.c for 8-10 hr, cooling to below 450 deg.c in the rate no higher than 30 deg / hr and discharging. The high strength and high toughness structural steel with cheap Si and Mn as main elements has yield strength not lower than 1170 MPa, tensile strength not lower than 1274 MPa, specific elongation not lower than 9 %, reduction of area not lower than 45 %, and impact toughness not lower than 62J.

Description

technical field [0001] The invention relates to the composition design and manufacturing method of structural steel in the metallurgical industry, in particular to the composition design and manufacturing method of high-strength and high-toughness structural steel. Background technique [0002] Structural steel is a common alloy steel. According to the content of chromium and nickel elements in steel, we can temporarily divide it into chromium-nickel structural steel and chromium-free nickel structural steel (chromium-free nickel structural steel is mainly divided into manganese steel, silicon-manganese steel, boron steel, manganese-boron steel, Manganese-molybdenum-boron steel, manganese-vanadium-boron steel, vanadium steel, silicon-manganese-molybdenum-vanadium steel, etc.) two categories. High-strength and high-toughness structural steel generally refers to structural steel with strength ≥ 1200Mpa and impact toughness Aku ≥ 60J. [0003] High-strength, high-toughness st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/00C21D11/00B21B37/74C21D1/26
Inventor 刘湘江黄泽民范文杰
Owner BAOSTEEL SPECIAL STEEL CO LTD
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