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Q550MD low-alloy high-strength steel plate and production method thereof

A high-strength steel plate and production method technology, applied in the direction of process efficiency improvement, furnace type, furnace, etc., can solve the problems of low plate shape qualification rate and yield rate, increased alloy cost, short production process, etc., to achieve guaranteed performance and plate Shape, reduce alloy cost, improve plasticity and toughness

Active Publication Date: 2021-06-18
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

0.15wt%~0.25wt% alloy Cr is added to this composition, and the cost of the alloy is high; in addition, in addition to the two-stage controlled rolling and post-rolling controlled cooling process, off-line quenching + tempering heat treatment is also carried out, the process is complicated and the production efficiency is high. low production cost
[0006] The patent with the publication number CN102433498 A discloses "a Q550D high-quality structural steel plate and its production method". Steel plate, but in addition to adding an alloy of NB, V, and Ti in its composition design, 0.10wt%~0.20wt% Mo is added, and the alloy cost is high
In addition, this method requires a reddening temperature of 450-600°C. At this temperature, due to uneven cooling, the shape of the steel plate is poor, and the pass rate of the shape and the yield of the product are both low, so it is not suitable for mass production.
[0007] The patent with publication number CN201010597657 A discloses "Q550D(E) steel plate of high-strength and toughness structural steel with bainite structure and its production method". The method obtains high-strength and toughness steel plate Q550D(E) through TMCP process, with simple process and short production process , but more precious alloys are added to its composition, and the addition amount of its alloy Nb+Ti+V+Mo+B is 0.2wt%~0.35wt%, especially the addition of 0.15wt%~0.25wt% Mo alloy, greatly Increased alloy cost of the product

Method used

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  • Q550MD low-alloy high-strength steel plate and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] To produce Q550MD low-alloy high-strength steel plates with a thickness specification of 20mm, smelting molten steel with the following mass percentage chemical composition: C: 0.07wt%, Si: 0.10wt%, Mn: 1.60wt%, P: 0.013wt%, S: 0.005 wt%, Nb: 0.03wt%, Ti: 0.010wt%, B: 0.0012wt%, Als: 0.02wt%, the rest is Fe; the carbon equivalent is 0.34; the steel plate is LF-refined for 22 minutes by adding ferro-titanium for titanium microalloying Ferro-boron is added during soft blowing for 2 minutes to carry out boron micro-alloying. The total refining time of LF is 35 minutes, and the sum of inclusion levels is 0.5; the thickness of continuous casting slabs is 220mm, and the slabs are stacked and slowly cooled for 24 hours before being reheated in the furnace. After the slab is heated, the surface temperature is 1210°C, and the total heating time is 240 minutes; two-stage controlled rolling is adopted, the thickness to be warmed is 60mm, the final rolling temperature is 790°C, and ...

Embodiment 2

[0048] To produce Q550MD low-alloy high-strength steel plate with a thickness specification of 20mm, smelting molten steel with the following mass percentage chemical composition: C: 0.09wt%, Si: 0.20wt%, Mn: 1.70wt%, P: 0.009wt%, S: 0.003 wt%, Nb: 0.04wt%, Ti: 0.025wt%, B: 0.0016wt%, Als: 0.04wt%, and the rest is Fe. The carbon equivalent is 0.37. Ferro-titanium was added to the steel plate during LF refining for 24 minutes to carry out micro-alloying of titanium, and ferro-boron was added during soft blowing for 2.5 minutes to carry out micro-alloying of boron. The total refining time of LF was 40 minutes, and the sum of inclusion grades was 0.5; The thickness of the slab is 260mm, and the slabs are stacked and slowly cooled for 27 hours and reheated in the furnace. 840°C, the steel throwing speed of the last pass is 3.2m / s; the steel plate is cooled by DQ+air cooling+ACC three-stage cooling, the starting cooling temperature of the DQ section is 820°C, the cooling rate is 1...

Embodiment 3

[0050] To produce Q550MD low-alloy high-strength steel plates with a thickness specification of 25mm, and to smelt molten steel with the following mass percentage chemical composition: C: 0.08wt%, Si: 0.15wt%, Mn: 1.65wt%, P: 0.01wt%, S: 0.003 wt%, Nb: 0.035wt%, Ti: 0.015wt%, B: 0.0013wt%, Als: 0.028wt%, and the rest is Fe. The carbon equivalent is 0.355. Ferro-titanium was added to the steel plate during LF refining for 23 minutes to carry out micro-alloying of titanium, and ferro-boron was added during soft blowing for 2.5 minutes to carry out micro-alloying of boron. The total refining time of LF was 42 minutes, and the sum of inclusion grades was 0.5; The thickness of the slab is 260mm, and the slabs are stacked and slowly cooled for 26 hours and reheated in the furnace. 790°C, the steel throwing speed of the last pass is 3.0m / s; the steel plate is cooled by DQ+air cooling+ACC three-stage cooling, the starting cooling temperature of the DQ section is 766°C, the cooling sp...

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Abstract

The invention relates to a Q550MD low-alloy high-strength steel plate. The Q550MD low-alloy high-strength steel plate is prepared from the following chemical components in percentage by mass: 0.07-0.09% of C, 0.10-0.20% of Si, 1.60-1.70% of Mn, less than or equal to 0.013% of P, less than or equal to 0.005% of S, 0.03-0.04% of Nb, 0.010-0.025% of Ti, 0.0012-0.0016% of B, 0.02-0.04% of Als and the balance of Fe and inevitable residual elements and impurities in the production process. According to the production method of the Q550MD low-alloy high-strength steel plate, in the middle stage of LF refining, that is, 1 / 3-1 / 2 of the total refining time, titanium microalloying is carried out, N fixation is carried out through Ti, ferroboron is added after soft blowing is carried out for 2-3 min, boron microalloying is carried out, the LF total refining time is controlled to be 35-50 min, and it is guaranteed that the total grade of inclusions in steel does not exceed 1.0 grade; the alloy cost can be greatly reduced, the production process is simple, and the produced steel plate is good in shape.

Description

technical field [0001] The invention relates to a high-strength steel plate and a production method thereof, in particular to a Q550MD low-alloy high-strength steel plate and a production method thereof. Background technique [0002] High-strength steel refers to adding a certain amount of alloying elements on the basis of carbon steel to effectively improve the strength and toughness of steel; such as strong carbide forming elements Nb, V, Ti, Cr, Mo, Ni, Cu, Al, and through Steel grades developed by strengthening methods such as fine grain strengthening, solid solution strengthening, precipitation strengthening, and second phase particle strengthening. Low-alloy high-strength steel generally has a total amount of alloying elements < 0.1wt%, has ultra-high strength, good toughness and low production cost, and has strong market competitiveness, especially TMCP low-carbon bainite represented by Q550MD In recent years, high-strength steel has been more and more favored by ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21C7/00C21D1/18C21D6/00C21D8/02C21D9/00C22C33/04B21B37/74
CPCC22C38/02C22C38/04C22C38/002C22C38/12C22C38/14C22C38/06C22C33/04C21D6/005C21D6/008C21D8/0221C21D9/0081C21D1/18C21C7/0006B21B37/74C21D2211/005C21D2211/002Y02P10/20
Inventor 王丽敏李玉谦杜琦铭徐晓孙电强成慧梅杨雄张瑞超
Owner HANDAN IRON & STEEL GROUP
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