800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate

A sensitive quenching and tempering technology with low welding cracks, applied in the field of metallurgy, can solve problems such as plasticity index and low temperature impact performance gap

Inactive Publication Date: 2015-04-22
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's 800MPa-level steel for hydropower still mainly relies on imports. Although some domestic companies have developed 80...

Method used

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  • 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate
  • 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate
  • 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0034] The composition of the steel in Examples 1-3 is consistent, and the steelmaking, continuous casting, forging slab heating and rolling processes are consistent, the difference lies in the subsequent quenching and tempering heat treatment process system, the specific process is as follows:

[0035] ⑴Steelmaking: A furnace of steel was smelted, and its actual chemical composition (% by weight) is, C: 0.1%, Si: 0.28%, Mn: 1.38%, Al: 0.04%, Cr: 0.48%, Ni: 0.44% , Mo: 0.38%, Nb: 0.02%, V: 0.04%, Ti: 0.014%, Cu: 0.25%, S: 0.0004%, P: 0.009%, N≤0.0060%, H≤0.00030%, B: 0.001% , the balance being Fe. Casting into a continuous casting billet with a specification of 320mm×2280mm×2100mm; the billet has undergone thermal inspection, stack cooling for 48 hours, and billet surface inspection before entering the furnace. The billet surface quality is good, and there is no grinding billet.

[0036] (2) Billet heating and rolling: The billet is heated and homogenized in two stages and th...

Embodiment 4

[0043]This embodiment is an 800MPa grade low welding crack sensitivity quenched and tempered steel plate for hydropower. The chemical composition of the steel plate is: C: 0.09%, Si: 0.24%, Mn: 0.7%, P: 0.013%, S : 0.002%, Nb: 0.035%, Ti: 0.012%, Ni: 0.30%, Alt: 0.020%, V: 0.035%, Cr: 0.25%, Mo: 0.25%, Cu: 0.15%, N: 0.0060%, H : 0.00030%, B: 0.0008%, and the balance is Fe.

[0044] The preparation method of the present embodiment steel plate, concrete steps are as follows:

[0045] (1) Smelt molten steel according to the set chemical composition and cast it into a slab with a thickness of 315mm; the chemical composition of the slab by weight percentage is: C: 0.09%, Si: 0.24%, Mn: 0.7%, P: 0.013%, S: 0.002%, Nb: 0.035%, Ti: 0.012%, Ni: 0.30%, Alt: 0.020%, V: 0.035%, Cr: 0.25%, Mo: 0.25%, Cu: 0.15%, N: 0.0060%, H: 0.00030%, B: 0.0008%, and the balance is Fe.

[0046] (2) Rough rolling is carried out after the billet is heated and homogenized in two stages. In the first stage...

Embodiment 5

[0051] This embodiment is an 800MPa grade low welding crack sensitivity quenched and tempered steel plate for hydropower. The chemical composition of the steel plate is: C: 0.11%, Si: 0.28%, Mn: 0.9%, P: 0.01%, S : 0.001%, Nb: 0.015%, Ti: 0.016%, Ni: 0.40%, Alt: 0.050%, V: 0.040%, Cr: 0.45%, Mo: 0.35%, Cu: 0.20%, N: 0.0020%, H : 0.00010%, B: 0.001%, and the balance is Fe.

[0052] The preparation method of the present embodiment steel plate, concrete steps are as follows:

[0053] (1) Smelt molten steel according to the set chemical composition and cast it into a slab with a thickness of 320mm; the chemical composition of the slab by weight percentage is: C: 0.11%, Si: 0.28%, Mn: 0.9%, P: 0.01%, S: 0.001%, Nb: 0.015%, Ti: 0.016%, Ni: 0.40%, Alt: 0.050%, V: 0.040%, Cr: 0.45%, Mo: 0.35%, Cu: 0.20%, N: 0.0020%, H: 0.00010%, B: 0.001%, and the balance is Fe.

[0054] (2) Rough rolling is carried out after the billet is heated and homogenized in two stages. In the first stage, i...

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Abstract

The invention relates to an 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate. The steel plate comprises the following components in percentage by weight: 0.09-0.14% of C, 0.24-0.35% of Si, 0.7-1.45% of Mn, less than or equal to 0.013%, less than or equal to 0.002% of S, less than or equal to 0.035% of Nb, 0.012-0.02% of Ti, 0.30-0.50% of Ni, 0.020-0.070% of Alt, 0.035-0.060% of V, 0.25-0.60% of Cr, 0.25-0.55% of Mo, 0.15-0.30% of Cu, less than or equal to 0.0060% of N, less than or equal to 0.00030% of H, 0.0008-0.002% of B and the balance of Fe. The preparation method comprises the following steps: smelting and casting to a cast blank according to set compositions; heating and rolling in two stages; and quickly cooling to temper and thermally treat to obtain excellent strength, plasticity and low-temperature impact toughness which are matched, so that the request on hydroelectric steel is satisfied.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a steel plate for hydroelectricity, in particular to an 800MPa grade low welding crack sensitivity quenched and tempered steel plate for hydroelectricity and a preparation method thereof. Background technique [0002] Most of the steel used in hydropower is wide and thick plates, which are usually used to construct water diversion pressure pipes and auxiliary facilities such as ribs, branch pipes and volutes in plant dams. Penstock is one of the main parts of pumped storage in hydropower projects. The pressure pipe is filled with water from the reservoir, the forebay or the surge chamber, and after the water is pressurized, it is introduced into the turbine or other equipment to meet the needs of power generation and water supply, and concentrates all or most of the water head of the hydropower station. The penstock bears the impact pressure of water hammer and the largest ...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/02
Inventor 霍松波方磊张清辉陈礼清李长生黄建华党振旗张丙军赵阳
Owner NANJING IRON & STEEL CO LTD
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