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High-strength-and-toughness high-phosphorus steel and production method

A tough high-phosphorus steel, high-strength technology, applied in the field of high-strength, high-toughness, high-phosphorus steel, can solve the problems of increasing additional costs

Inactive Publication Date: 2018-12-18
张家港创博金属科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although phosphorus is unfavorable to the toughness of steel, its effect of improving strength is obvious; at the same time, in the current steel smelting process, a special dephosphorization process is used to reduce the phosphorus content, which increases additional costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Adopt above-mentioned method to make diameter 8mm wire rod, by weight percent, chemical composition is: C 0.48%, Si 0.8%, Cr1.5%, P 0.16%, all the other are Fe and impurity element;

[0040] Heat preservation at 1150°C for 2 hours, rolling reduction 60%, rolling reduction 60% at 800-840°C, quenching to room temperature after rolling; tempering at 450°C for 1 hour, and then air cooling to room temperature to obtain the target product;

[0041] After inspection, the tensile strength is 1150MPa, the elongation after fracture is 28%, and the impact energy at -110°C is 85J.

Embodiment 2

[0043] Adopt the above-mentioned method to make thickness be 16mm steel plate, by weight percentage, chemical composition is: C 0.55%, Si 0.7%, Cr 2.2%, P 0.18%, Mo 0.8%, all the other are Fe and impurity elements;

[0044] Insulate at 1100°C for 2 hours, then roll with a reduction of 60%, then roll at 820-850°C with a reduction of 70%, and directly quench to room temperature after rolling; temper at 500°C for 1 hour, and air-cool to room temperature;

[0045] After inspection, the tensile strength is 1210MPa, the elongation after fracture is 26%, and the impact energy at -110°C is 150J.

Embodiment 3

[0047] Adopting said method to make thickness is 24mm wire rod, and by weight percent, chemical composition is: C 0.52%, Si 0.9%, Cr 1.6%, P 0.12%, Mn 2.2%, all the other are Fe and impurity elements;

[0048] Insulate at 1200°C for 2 hours, then roll with a reduction of 65%, then roll at 820-850°C with a reduction of 80%, and directly quench to room temperature after rolling; temper at 520°C for 1 hour, and air-cool to room temperature;

[0049] After inspection, the tensile strength is 1230MPa, the elongation after fracture is 22%, and the impact energy at -110°C is 90J.

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Abstract

The invention relates to high-strength-and-toughness high-phosphorus steel and a production method. The high-strength-and-toughness high-phosphorus steel comprises chemical components including, by weight, 0.4%-0.8% of C, 0.55%-1.6% of Si, 0.4%-4.0% of Cr, 0.03%-0.3% of P and the balance Fe and impurity elements; heat preservation at 1100-1250 DEG C for 1-2 hours is carried out, and then rolling with the rolling reduction larger than or equal to 60% is carried out; rolling with the rolling reduction larger than or equal to 60% is carried out at 750-850 DEG C, and quenching is carried out to the room temperature after rolling; heating to 800-850 DEG C is carried out, heat preservation is carried out for 2-2.5 hours, then rolling with the rolling reduction larger than or equal to 60% is carried out, and quenching to room temperature is carried out after rolling; at 400-550 DEG C, tempering is kept for 1 to 1.5 hours, and then air cooling to the room temperature is carried out; and the tensile strength is larger than or equal to 1100 MPa, the elongation after fracture is larger than or equal to 20%, and the impact energy at -110 DEG C is larger than or equal to 60 J.

Description

technical field [0001] The invention relates to high-strength, high-toughness, high-phosphorus steel, which belongs to the technical fields of iron and steel metallurgy and steel rolling, and in particular relates to a medium-high-carbon, high-phosphorus steel that can resist impact at -110°C and has a tensile strength of 1100 MPa. Background technique [0002] Medium-high carbon steel is widely used in cold heading, bearings, fastening, cables and other occasions with high strength requirements. The most important reason is that carbon is the cheapest strengthening element, which can replace a large number of alloy strengthening elements and reduce costs. [0003] For medium and high carbon steels, phosphorus is usually strictly limited as a harmful impurity element. Excessive phosphorus will seriously deteriorate the low temperature toughness, elongation and surface shrinkage; on the other hand, due to the uneven segregation and the brittleness of phosphorus itself, the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/18C22C38/34C21D8/00
CPCC22C38/02C21D8/005C22C38/002C22C38/18C22C38/34
Inventor 李小宝
Owner 张家港创博金属科技有限公司
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