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A large input energy welded high-strength hot-rolled steel bar and its production process

A technology for high-energy welding and steel bars, applied in the field of high-strength steel bars for welding, can solve the problems of decreased strength and toughness of welded parts, deteriorated welding performance of steel plates, low construction efficiency, etc. Micro-crack source, the effect of solving the inhomogeneous structure

Active Publication Date: 2016-05-11
TIANSHUN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under such a large welding input energy, the heat-affected zone (HAZ) structure of traditional low-alloy high-strength steel (HSLA) will grow rapidly, the strength and toughness of the welded part will be greatly reduced, and welding cold cracks will easily occur question
In addition, for the traditional thermomechanical rolling (TMCP) technology, with the increase of the strength and thickness of the steel bar, the carbon equivalent must be increased to ensure the conventional performance, but the increase of the carbon equivalent will deteriorate the welding performance of the steel plate
Existing high-strength steel bars do not have the performance of high-energy-input welding resistance. When welding, high-energy-input welding methods exceeding 50kJ / cm cannot be used for welding. The construction efficiency is low, and the requirements for high-energy-input welding cannot be met, and the welding efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment is a high-strength hot-rolled steel bar welded with large input energy, containing the following chemical components in weight percentage: C: 0.27%, Si: 0.16%, Mn: 1.11%, P: 0.009%, S: 0.001%, Als : 0.057%, Nb: 0.006%, V: 0.06%, Ti: 0.035%, Ni: 0.05%, Cu: 0.07%, Cr: 0.6%, Mo: 0.53%, B: 0.007%, Lanthanum: 0.07%, Cerium : 0.03%, praseodymium: 0.01%, the rest is Fe and unavoidable impurities, carbon equivalent 0.4-0.8%.

[0016] The production technology of the large heat input welding high-strength hot-rolled steel bar of the present embodiment is carried out according to the following steps:

[0017] (1) Put the smelted steel bar into the heating furnace and heat it to 1310°C, then cool the steel bar quickly to 670°C through the first cooling process online, and then quench it with water or quenching liquid in the quenching device for 25 seconds, and then return to The fire heating furnace is heated to 890°C for tempering, and then cooled to room tempera...

Embodiment 2

[0024]This embodiment is a high-strength hot-rolled steel bar welded with large input energy, containing the following chemical components in weight percentages: C: 0.29%, Si: 0.17%, Mn: 1.12%, P: 0.008%, S: 0.002%, Als : 0.059%, Nb: 0.005%, V: 0.08%, Ti: 0.037%, Ni: 0.06%, Cu: 0.09%, Cr: 0.7%, Mo: 0.54%, B: 0.008%, Lanthanum: 0.08%, Cerium : 0.04%, praseodymium: 0.02%, the rest is Fe and unavoidable impurities, carbon equivalent 0.4-0.8%.

[0025] The production technology of the large heat input welding high-strength hot-rolled steel bar of the present embodiment is carried out according to the following steps:

[0026] (1) Send the smelted steel bar into the heating furnace and heat it to 1320°C, and then cool the steel bar quickly to 680°C through the first cooling process online, and then quench it with water or quenching liquid in the quenching device for 26 seconds, and then return to The fire heating furnace is heated to 900°C for tempering, and then cooled to room te...

Embodiment 3

[0033] This embodiment is a high-strength hot-rolled steel bar welded with large input energy, which contains the following chemical components in weight percentages: C: 0.28%, Si: 0.15%, Mn: 1.13%, P: 0.007%, S: 0.003%, Als : 0.058%, Nb: 0.007%, V: 0.07%, Ti: 0.036%, Ni: 0.07%, Cu: 0.08%, Cr: 0.8%, Mo: 0.55%, B: 0.009%, Lanthanum: 0.09%, Cerium : 0.05%, praseodymium: 0.03%, the rest is Fe and unavoidable impurities, carbon equivalent 0.4-0.8%.

[0034] The production technology of the large heat input welding high-strength hot-rolled steel bar of the present embodiment is carried out according to the following steps:

[0035] (1) Send the smelted steel bar into the heating furnace and heat it to 1330°C, and then cool the steel bar quickly to 690°C through the first cooling process online, and then quench it with water or quenching liquid in the quenching device for 27 seconds, and then return to The fire heating furnace is heated to 910°C for tempering, and then cooled to ro...

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Abstract

The present invention is a large input energy welded high-strength hot-rolled steel bar, composition: C: 0.27-0.29%, Si: 0.15-0.17%, Mn: 1.11-1.13%, P: 0.007-0.009%, S: 0.001-0.003% , Als: 0.057-0.059%, Nb: 0.005-0.007%, V: 0.06-0.08%, Ti: 0.035-0.037%, Ni: 0.05-0.07%, Cu: 0.07-0.09%, Cr: 0.6-0.8%, Mo: 0.53-0.55%, B: 0.007-0.009%, lanthanum: 0.07-0.09%, cerium: 0.03-0.05%, praseodymium: 0.01-0.03%, and the rest is Fe; the invention can effectively improve the strength of steel bars and the influence of welding heat area toughness.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel bars for welding, in particular to a high-strength hot-rolled steel bar welded with large input energy and a production process thereof. Background technique [0002] In the past, the welding line energy of steel in welding construction ≥ 50kJ / cm can be called high-line energy welding, but current data show that the actual welding line energy of gas-electric vertical welding large-line energy welding has even exceeded 500kJ / cm. Under such a large welding input energy, the heat-affected zone (HAZ) structure of traditional low-alloy high-strength steel (HSLA) will grow rapidly, the strength and toughness of the welded part will be greatly reduced, and welding cold cracks will easily occur question. In addition, for the traditional thermomechanical rolling (TMCP) technology, with the increase of the strength and thickness of the steel bar, the carbon equivalent must be increased to ensur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C21D8/06C21D1/19
CPCC21D8/08C22C38/005C22C38/04C22C38/06C22C38/18C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 姚圣法吴海洋
Owner TIANSHUN GROUP
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