High-efficiency and low-cost 610 MPa hydropower steel and production method thereof

A production method and 610mpa technology, applied in the field of alloy steel production technology, can solve the problems of high production cost and no obvious competitive advantage.

Inactive Publication Date: 2016-12-14
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Inevitably, the traditional quenching and tempering process requires high production costs, and there is no obvious competitive advantage in the severe market situation. Therefore, it is urgent to invent a new production process to reduce production costs

Method used

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  • High-efficiency and low-cost 610 MPa hydropower steel and production method thereof
  • High-efficiency and low-cost 610 MPa hydropower steel and production method thereof
  • High-efficiency and low-cost 610 MPa hydropower steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 A high-efficiency and low-cost 610 MPa hydropower steel and its production method

[0025] The composition of its chemical composition mass percentage is as follows:

[0026] C: 0.08%, Si: 0.25%, Mn: 1.50%, P: 0.012%, S: 0.005%, Nb: 0.017%, V: 0.034%, Ti: 0.015%, Ni: 0.18%, Mo: 0.15%, The rest is Fe and not and avoid impurities.

[0027] The process route is: KR hot metal pretreatment-converter smelting-LF, RH refining-continuous casting-slow cooling-continuous casting billet heating-rolling-cooling-straightening-finishing-tempering. in,

[0028] (1) The above-mentioned prepared raw materials are smelted on a 210-ton converter, and cut into 250mm×2200mm×3060mm square billets after continuous casting, and the continuous casting billets are heated to 1200°C by a heating furnace, and the heating is uniform; the converter adopts a top-bottom combined blowing converter smelting;

[0029] (2 LF, RH refining) LF+RH refining is adopted, the soft blowing time after...

Embodiment 2

[0037] Example 2 A high-efficiency and low-cost 610 MPa hydropower steel and its production method

[0038] The composition of its chemical composition mass percentage is as follows:

[0039] C: 0.07%, Si: 0.32%, Mn: 1.58%, P: 0.011%, S: 0.0045%, Nb: 0.032%, V: 0.045%, Ti: 0.008%, Ni: 0.11%, Mo: 0.23%, The rest is Fe and not and avoid impurities.

[0040] The process route is: KR hot metal pretreatment-converter smelting-LF, RH refining-continuous casting-slow cooling-continuous casting billet heating-rolling-cooling-straightening-finishing-tempering. in,

[0041](1) The above-mentioned prepared raw materials are smelted on a 210-ton converter, and cut into 250mm×2200mm×3060mm square billets after continuous casting, and the continuous casting billets are heated to 1200°C by a heating furnace, and the heating is uniform; the converter adopts a top-bottom combined blowing converter smelting;

[0042] (2) LF and RH refining adopt LF+RH refining, the soft blowing time after d...

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Abstract

The invention discloses high-efficiency and low-cost 610 MPa hydropower steel and a production method thereof. The hydropower steel comprises the following chemical components in percentage by mass: 0.07-0.09% of C, 0.15-0.35% of Si, 1.40-1.60% of Mn, not greater than 0.15% of P, not greater than 0.08% of S, 0.015-0.035% of Nb, 0.030-0.050% of V, 0.008-0.030% of Ti, 0.10-0.30% of Ni, 0.10-0.30% of Mo, and the balance Fe and inevitable impurities. A process route comprises KR hot metal pre-treatment, converter smelting, LF and RH refining, continuous casting, slow cooling, continuous casting blank heating, rolling, cooling, straightening, finishing and tempering. According to the high-efficiency and low-cost 610 MPa hydropower steel and the production method thereof, which are disclosed by the invention, a production flow is shortened, energy consumption is reduced, a high-cost limit of a traditional production process is overcome, and the product quality is ensured.

Description

technical field [0001] The invention belongs to the field of alloy steel production technology, and in particular relates to a high-efficiency and low-cost 610 MPa hydropower steel and a production method thereof. Background technique [0002] With the increase of national hydropower projects, 610MPa hydropower steel has been widely used. Relatively speaking, the order price of this series of steel grades is relatively high, and it has also become one of the double-high products of major domestic steel mills. This steel type requires quenching and tempering delivery, mainly to ensure product performance stability and safety in use. The traditional quenching and tempering process is quenching + tempering (DQ+T), aiming to obtain lath-shaped tempered martensite structure , the structure has high strength and good plasticity and toughness. In addition, the steel plate produced by the traditional quenching and tempering process also has a high level of flatness. [0003] Inevit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/08C22C33/04
CPCC22C33/04C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14
Inventor 孔雅宋国栋薛艳龙杜平程绍娟李复磊宋婷婷
Owner SHANDONG IRON & STEEL CO LTD
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