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Q370qE-HPS bridge steel with low cost and high performance, and production method

A q370qe-hps, production method technology, applied in the direction of temperature control, etc., can solve the problems of lamellar tearing of penetration fillet welding, low impact energy of welded joints, unstable performance, etc., to ensure low temperature impact toughness and stable yield strength , The effect of reducing the yield ratio

Active Publication Date: 2021-01-08
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-performance bridge steel plate Q370qE-HPS is widely used in highway bridges, railway bridges, and highway-rail bridges. Steel is mainly used for normalizing steel plates. The smelting process cost of the normalizing heat treatment process is more than 200 yuan, not including the cost of transshipment. After normalizing, the performance of the steel plates will be unstable, the impact energy of the welded joints will be low, and delamination will occur. Or penetration fillet welding lamellar tear and other quality problems

Method used

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  • Q370qE-HPS bridge steel with low cost and high performance, and production method
  • Q370qE-HPS bridge steel with low cost and high performance, and production method
  • Q370qE-HPS bridge steel with low cost and high performance, and production method

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Embodiment Construction

[0019] A kind of low-cost high-performance Q370qE-HPS bridge steel provided by the following examples, the steel plate thickness specification is respectively 22mm, 33mm, 55mm, and its chemical composition and mass percentage are as shown in Table 1,

[0020] Table 1 embodiment steel plate chemical composition (wt%)

[0021] element C Si mn P S Nb Ti Example 1 0.06 0.15 1.63 0.013 0.002 0.031 0.013 element Ni Cr Mo Cu B N Al Example 1 0.03 0.23 0.009 0.02 0.0002 0.0035 0.031 element C Si mn P S Nb Ti Example 2 0.07 0.20 1.65 0.011 0.001 0.045 0.012 element Ni Cr Mo Cu B N Al Example 2 0.02 0.26 0.008 0.03 0.0003 0.0038 0.028 element C Si mn P S Nb Ti Example 3 0.075 0.36 1.69 0.010 0.001 0.048 0.015 element Ni Cr Mo Cu B N Al Example 3 0.04 0.28 0.010 0.01 0.0002 0.0042 0.033

[0022] .

[0023] The produc...

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Abstract

The invention discloses Q370qEHPS bridge steel with low cost and high-performance, and relates to the technical field of steel production. The Q370qEHPS bridge steel comprises the following chemical components by mass: 0.05%-0.08% of C, 0.10%-0.40% of Si, 1.61%- 1.70% of Mn, no more than 0.015% of P, no more than 0.0030% of S, 0.030%-0.050% of Nb, 0.010%-0.018% of Ti, no more than 0.05% of residual Ni, 0.20%-0.30% of Cr, no more than 0.05% of residual Mo, no more than 0.05% of residual Cu, no more than 0.05% of residual B, no more than 0.005% of N, 0.020%-0.050% of Al, and the balance Fe and impurities. A TMCP rolling process is adopted, so that the bridge steel plate which is low in yield ratio, excellent in welding performance and capable of meeting standard requirements is obtained, andthe market competitiveness of enterprises is improved.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a low-cost high-performance Q370qE-HPS bridge steel and a production method. Background technique [0002] High-performance bridge steel plate Q370qE-HPS is widely used in highway bridges, railway bridges, and highway-rail bridges. Steel is mainly used for normalizing steel plates. The smelting process cost of the normalizing heat treatment process is more than 200 yuan, not including the cost of transshipment. After normalizing, the performance of the steel plates will be unstable, the impact energy of the welded joints will be low, and delamination will occur. Or penetration fillet welding lamellar tear and other quality problems. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a low-cost high-performance Q370qE-HPS bridge steel, its chemical composition and mass percentage are as follows: C: 0.05% to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/38C22C38/26C22C38/28C22C38/06B21B37/74
CPCC22C38/02C22C38/38C22C38/26C22C38/28C22C38/06B21B37/74Y02P10/20C22C38/58C22C38/48C22C38/50C22C38/44C22C38/42C22C38/54C22C38/001C21C5/46B21C51/005C21C2005/4626C21D2211/001
Inventor 翟冬雨洪君丁叶李翔高燕张媛钰
Owner NANJING IRON & STEEL CO LTD
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