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Alloy steel wire rod for standard part

A technology for alloy steel and standard parts, applied in the field of alloy steel wire rods for standard parts, can solve problems such as plasticity decline and tensile strength increase, and achieve the effects of inhibiting growth, excellent plastic workability, and reducing softening annealing time

Inactive Publication Date: 2018-10-16
CHANGSHU LONGTENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above-mentioned alloy steel wire rod is used to produce various screws, because it contains a high alloy content, and chromium, manganese, and molybdenum are all hardenability enhancing elements, the products produced by the traditional conventional slow cooling process will be in the cooling process. It is easy to produce bainite or martensite structure, resulting in an increase in the tensile strength of the product and a decrease in plasticity

Method used

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Examples

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Effect test

preparation example Construction

[0015] The alloy steel wire rod for standard parts of the present invention has a chemical composition weight percentage of: C: 0.38-0.48%, Mn: 0.75-1.00%, Si: 0.15-0.35%, P: ≤0.035%, S: ≤0.040% , Cr: 0.80~1.10%, Mo: 0.15~0.25%, the remainder is Fe and unavoidable impurities; its preparation method includes the following steps: (a) Heating: heating the billet to a regenerative blast furnace gas heating furnace 1000~1060℃, followed by tapping at a temperature of 920~980℃; (b) Rolling: rolling the steel billet with a multi-pass rolling mill arranged alternately horizontally and vertically, and control the rolling temperature of the steel billet ≤950℃ (C) Cooling: the rolled steel billet is spun into loops at 820-860°C, rapidly cooled to 680-720°C at a rate of 2.2-2.5°C / s, and then ≤1.5°C / s Speed ​​heat preservation and slow cooling for 75~80s, natural cooling is enough. Through precise control of the temperature of alloy steel billets with specific element content, especially th...

Embodiment 1

[0020] This embodiment provides an alloy steel wire rod for standard parts, and its chemical composition weight percentage is:

[0021] C: 0.38%, Mn: 0.75%, Si: 0.15%, P: 0.032%, S: 0.035%, Cr: 0.80%, Mo: 0.25%, the balance is Fe and unavoidable impurities;

[0022] Its preparation method includes the following steps:

[0023] (a) Heating: Use a regenerative blast furnace gas heating furnace with a length of 20m to heat the billet continuously to 1030±30℃ in three stages, and control the temperature difference between the head, tail and the middle of the billet to not exceed 15 ℃, so as to ensure the uniformity of heating the billet and keep the temperature of the core surface of the billet consistent; then tap the steel at a temperature of 950±20°C;

[0024] (b) Rolling: the steel billet (actually the aforementioned tapping) is rolled by the 18-pass rolling mill arranged alternately horizontally and vertically and the finishing mill arranged at 45° top cross, and the rolled pieces ar...

Embodiment 2

[0027] This embodiment provides an alloy steel wire rod for standard parts, which is basically the same as in embodiment 1, except that its chemical composition weight percentage is: C: 0.48%, Mn: 1.00%, Si: 0.35% , P: 0.02%, S: 0.020%, Cr: 1.10%, Mo: 0.15%, the balance is Fe and unavoidable impurities.

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Abstract

The invention discloses an alloy steel wire rod for a standard part. The alloy steel wire rod for the standard part comprises the chemical components in percentage by weight: 0.38-0.48% of C, 0.75-1.00% of Mn, 0.15-0.35% of Si, less than or equal to 0.035% of P, less than or equal to 0.040% of S, 0.80-1.10% of Cr, 0.15-0.25% of Mo and the balance Fe and inevitable impurities. A preparation methodcomprises the following steps: (a) heating: heating a billet to 1000-1060 DEG C by adopting a coal gas heating furnace of a heat accumulating blast furnace, and then tapping steel at 920-980 DEG C; (b) rolling: rolling the billet by adopting a plurality of rolling mills which are horizontally and vertically arranged alternately, and controlling the rolling temperature of the billet to be smaller than or equal to 950 DEG C; and (c) cooling: spinning the rolled billet to loop at 820-860 DEG C. Therefore, metallographic structures of a product are primarily composed of ferrite and pearlite, so that the product has excellent plastic processability, and the softening and annealing time of a user is shortened.

Description

Technical field [0001] The invention relates to an alloy steel material, to a wire rod, in particular to an alloy steel wire rod for standard parts. Background technique [0002] The alloy steel wire rod for standard parts is based on the ASTM A193 / 193M-17 standard. It is a high-temperature alloy steel and a steel for making stainless steel screws. Its grade is B7, which is similar to the 42CrMo component of the domestic GB / T 3077-2015 alloy structural steel. When the above alloy steel wire rods are used to produce various screws, because they contain high alloy content, and chromium, manganese, and molybdenum are all hardenability enhancing elements, the products produced by the traditional conventional slow cooling process are in the cooling process It is easy to produce bainite or martensite structure, causing the product's tensile strength to increase and plasticity to decrease. Summary of the invention [0003] In view of the above-mentioned technical deficiencies, the purpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/22C22C33/04C21D8/02C21D11/00
CPCC21D8/0205C21D8/0247C21D11/00C22C33/04C22C38/02C22C38/04C22C38/22
Inventor 诸葛宇明缪忠季丙元
Owner CHANGSHU LONGTENG SPECIAL STEEL
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