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High-strength long-service-life rack steel

A long-life, rack steel technology, applied in the field of rack steel

Active Publication Date: 2019-09-27
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when searching the relevant domestic and foreign research reports, the research on the tensile strength Rm≥1650MPa and the symmetrical tension-compression fatigue strength σ-1≥750MPa of gear materials in the state of quenching + low temperature tempering is still blank.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Melt 40 tons of steel with the chemical composition shown below, carry out continuous casting, and make a continuous casting slab with a cross-sectional size of 200mm×200mm. The chemical composition of the obtained continuous casting slab includes: C: 0.25%, Si: 0.26% , Mn: 0.85%, P≤0.008%, S≤0.006%, Cr: 1.35%, Mo: 0.21%, Al: 0.022%, Nb: 0.035%, Ni: 0.75%, Ti: 0.0004%, Cu: 0.12% , N: 0.0074%, O: 0.0009%, B: 0.0006%, and the balance is Fe and unavoidable impurity elements.

[0036] Heat the continuous casting slab to 1180-1240°C, keep it warm for more than 3 hours, start rolling at no lower than 1050°C, and roll it into a φ48mm round steel. The final rolling temperature is not lower than 950°C. After annealing and H expansion annealing, sample heat treatment and inspection.

[0037] ① Take φ20*200mm from 1 / 2 radius as the heat treatment blank;

[0038] ②Heat treatment method: quenching: heating to 890°C±10°C, holding for 45 minutes, oil quenching at room temperature; te...

Embodiment 2

[0041] Melt 100 tons of steel with the chemical composition shown below, carry out continuous casting, and make a continuous casting slab with a cross-sectional size of 200mm×200mm. The chemical composition of the obtained continuous casting slab includes: C: 0.26%, Si: 0.27% , Mn: 0.86%, P≤0.010%, S≤0.003%, Cr: 1.36%, Mo: 0.25%, Al: 0.020%, Nb: 0.033%, Ni: 0.80%, Ti: 0.0008%, Cu: 0.12% , N: 0.0068%, O: 0.0010%, B: 0.0005%, and the balance is Fe and unavoidable impurity elements.

[0042] Heat the continuous casting slab to 1150-1200°C, keep it warm for more than 3 hours, start rolling at 1080°C, finish rolling temperature ≥ 950°C, roll to φ48, H-expansion annealing within 15 hours after the steel is off-line, sample heat treatment after H-expansion annealing ,test.

[0043] ① Take φ20*200mm from 1 / 2 radius as the heat treatment blank;

[0044] ②Heat treatment: Quenching heating at 890°C±10°C, heat preservation for 45 minutes, oil quenching at room temperature; tempering hea...

Embodiment 3

[0047] Melt 100 tons of steel with the chemical composition shown below, carry out continuous casting, and make a continuous casting slab with a cross-sectional size of 300mm×340mm. The chemical composition of the obtained continuous casting slab includes: C: 0.26%, Si: 0.26% , Mn: 0.86%, P≤0.008%, S≤0.006%, Cr: 1.38%, Mo: 0.21%, Al: 0.022%, Nb: 0.033%, Ni: 1.15%, Ti: 0.0004%, Cu: 0.06% , N: 0.0078%, O: 0.0008%, B: 0.0005%, and the balance is Fe and unavoidable impurity elements.

[0048] Heat the continuous casting slab to 1150-1240°C, keep it warm for more than 4.5 hours, start rolling at 1050°C, finish rolling at a temperature not lower than 950°C, roll to φ48, air-cool after rolling, and H-expand and anneal within 15 hours after the steel is rolled off the production line. After H-expansion annealing, sample heat treatment and inspection.

[0049] ① Take φ20*200mm from 1 / 2 radius as the heat treatment blank;

[0050] ②Heat treatment: heating to 890°C±10°C, holding for 45...

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Abstract

The invention relates to a high-strength long-service-life rack steel. After the steel is subjected to quenching and low-temperature tempering treatment, the tensile strength Rm is larger than or equal to 1650 MPa, and the symmetric tensile fatigue strength Sigma-1 is larger than or equal to 750 MPa. A great amount of data regression analysis is carried out through testing the contribution of the chemical elements to tensile strength and impact toughness, the chemical components are redesigned, so that the tensile strength and the fatigue strength of the rack steel are obviously improved, and the rack steel comprises the following components of, in percentage by mass, 0.22%-0.32% of C, 0.17%-0.37% of Si, 0.55%-1.55% of Mn, less than or equal to 0.015% of P, less than or equal to 0.030% of S, 0.60%-1.65% of Cr, 0.15%-0.45% of Mo, 0.65%-1.65% of Ni, 0.02%-0.25% of Cu, 0.02%-0.035% of Al, 0.01%-0.06% of Nb, 0.0003%-0.0006% of B.

Description

technical field [0001] The invention relates to the technical field of iron-based special steel metallurgy, in particular to a rack steel. Background technique [0002] The automobile industry is an important symbol to measure a country's economic development level. Western developed countries all have relatively high automobile manufacturing technology. The engine is the core component of the automobile, and the performance of the engine directly determines the performance of the automobile. Rack steel is mainly used as the processing material for engine sector gears and tooth plates. As an important force-bearing component, it bears huge torque and impact, and the force state is particularly complicated. The material is required to have extremely high strength index and good impact toughness index. φ20 blank sample, in the state of quenching + low temperature tempering (quenching: 890°C ± 10°C, heat preservation for 45 minutes, oil quenching; tempering: 180°C ± 10°C, heat...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/54C22C38/58C21D8/06C21D1/26
CPCC22C38/02C22C38/04C22C38/002C22C38/44C22C38/58C22C38/42C22C38/48C22C38/54C22C38/06C21D8/065C21D1/26
Inventor 杨高成曹红福黄镇孙鸿平
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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