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Low-cost high-performance q370qe-hps bridge steel and its production method

A q370qe-hps, high-performance technology, used in low-cost high-performance Q370qE-HPS bridge steel and production fields, can solve the problems of lamellar tearing of penetration fillet welds, low impact energy of welded joints, and unstable performance. Ensure the effect of low temperature impact toughness, refined grain size and stable yield ratio

Active Publication Date: 2021-11-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Low-cost high-performance q370qe-hps bridge steel and its production method
  • Low-cost high-performance q370qe-hps bridge steel and its 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 a low-cost high-performance Q370qE-HPS bridge steel, which relates to the technical field of iron and steel production. Its chemical composition and mass percentage are as follows: C: 0.05%-0.08%, Si: 0.10%-0.40%, Mn: 1.61% ~1.70%, P≤0.015%, S≤0.0030%, Nb: 0.030%~0.050%, Ti: 0.010%~0.018%, residual Ni≤0.05%, Cr: 0.20%~0.30%, residual Mo≤0.05%, Residual Cu≤0.05%, residual B≤0.05%, N≤0.005%, Al: 0.020%~0.050%, the balance is Fe and impurities. The TMCP rolling process is used to obtain bridge steel plates with low yield ratio and excellent welding performance that meet the standard requirements, which improves the market competitiveness of the enterprise.

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 Patents(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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