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Low alloy and high strength Q420C medium steel plate and production method thereof

A low-alloy, high-strength, production method technology, applied in the field of material processing, can solve the problems of high manufacturing cost, long production cycle, complex production process, etc., and achieve the effect of low manufacturing cost, loose process system and simple production process

Active Publication Date: 2014-09-03
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel plate produced by this method has good toughness, but this method requires heat treatment of the steel plate, the manufacturing cost is high, the production process is complicated, and the production cycle is long

Method used

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  • Low alloy and high strength Q420C medium steel plate and production method thereof
  • Low alloy and high strength Q420C medium steel plate and production method thereof
  • Low alloy and high strength Q420C medium steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Adopting thickness is 250mm slab, and slab furnace temperature is 1170 ℃, and slab heating time is 280 minutes, and the (weight percentage) chemical composition of slab is: C0.16%, Si0.45%, Mn1.45%, P0 .02%, S0.008%, Als0.015%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 16 mm, the detailed rolling and cold removal process is shown in Table 1, and its mechanical properties are shown in Table 2.

[0048] Such as figure 1 Shown is the metallographic structure diagram of the steel plate in Example 1 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, the ferrite is the majority, the grains are fine and uniform, and there is no mixed crystal phenomenon. Due to the fine grains, ferrite is the majority, and ferrite has good plasticity and toughness, so the steel plate with this structure has good toughness and high strength.

[0049] Table 1 Rol...

Embodiment 2

[0054] Adopting thickness is 250mm slab, and slab furnace temperature is 1200 ℃, and slab heating time is 410 minutes, and the (weight percentage) chemical composition of slab is: C0.18%, Si0.35%, Mn1.55%, P0 .012%, S0.015%, Als0.03%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 40 mm, the detailed rolling and cooling process is shown in Table 3, and its mechanical properties are shown in Table 4.

[0055] Such as figure 2 Shown is the metallographic structure diagram of the steel plate in Example 2 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, the ferrite is the majority, the grains are fine and uniform, and there is no mixed crystal phenomenon. Due to the fine grains, ferrite is the majority, and ferrite has good plasticity and toughness, so the steel plate with this structure has good toughness and high strength.

[0056] Table 3 Rolling...

Embodiment 3

[0061] Adopting thickness is 250mm slab, and slab furnace temperature is 1187 ℃, and slab heating time is 385 minutes, and the (weight percentage) chemical composition of slab is: C0.17%, Si0.41%, Mn1.52%, P0 .013%, S0.005%, Als0.025%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 25 mm, the detailed rolling and cooling process is shown in Table 5, and its mechanical properties are shown in Table 6.

[0062] Such as image 3 Shown is the metallographic structure diagram of the steel plate in Example 3 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, the ferrite is the majority, the grains are fine and uniform, and there is no mixed crystal phenomenon. Due to the fine grains, ferrite is the majority, and ferrite has good plasticity and toughness, so the steel plate with this structure has good toughness and high strength.

[0063] Table 5 Rolling...

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Abstract

The invention discloses a low alloy and high strength Q420C medium steel plate. The low alloy and high strength Q420C medium steel plate comprises the following chemical components by weight percent: 0.16-0.18% of C, 0.35-0.45% of Si, 1.45-1.55% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.015-0.03% of Als, and the balance of iron and impurities. The invention also discloses a production method for the low alloy and high strength Q420C medium steel plate. The production method is simple, and has a short production cycle and low production cost; and the strength of the steel plate is moderate, the yield strength is 430-460MPa, and the tensile strength is 540-590MPa.

Description

technical field [0001] The invention relates to a material processing technology, in particular to a low-alloy high-strength Q420C medium-thick steel plate and a production method thereof. Background technique [0002] Low-alloy high-strength Q420C steel plate is widely used in construction machinery steel and plant structural parts production and other fields. The national standard requires the impact energy of Q420C steel plate to be greater than 34J at 0°C, which requires the steel plate to have good toughness while having high strength. The room temperature and low temperature structure of Q420C steel plate is generally ferrite + pearlite, and a certain amount of Nb, V, Ti and other microalloys are often added on the basis of C-Mn to ensure the matching of strength and toughness; Large cooling rate and very low final cooling temperature can fully refine the ferrite grains to improve the strength and toughness of the steel plate; or improve the mechanical properties of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 温利军张大治刘海涛董瑞峰徐建东赵超高军
Owner INNER MONGOLIA BAOTOU STEEL UNION
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