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Rolling process of low-alloy high-strength steel

A low-alloy, high-strength steel technology, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve problems such as roll sticking, roll damage, affecting production efficiency and product quality, and scrap steel

Active Publication Date: 2021-04-23
TANGSHAN YANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When rolling low-alloy high-strength steel Q420B, Q460C, Q500MC and other specifications below 3.0mm, the head and tail of the strip steel frequently occur, which can easily cause roll sticking and roll damage, and in severe cases, scrap steel will be generated, which greatly affects production efficiency and products. quality

Method used

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  • Rolling process of low-alloy high-strength steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw material composition (mass percentage) consists of C 0.13~0.17%, Si 0.10~0.20%, Mn 0.9~1.1%, P≤0.022%, S≤0.006%, Als 0.015~0.06%, Ti 0.030~0.045%, and the rest It is liquid Fe. According to the above-mentioned technological process and parameter that the present invention provides, make yield strength at 500 N / mm 2 The above low-alloy high-strength steel.

Embodiment 2

[0042] Raw material composition (mass percentage content) consists of C 0.13~0.17%, Si 0.10~0.20%, Mn 1.10~1.25%, P≤0.022%, S≤0.008%, Als 0.015~0.06%, Ti 0.030~0.040%, and the rest It is liquid Fe. According to the above-mentioned technological process and parameters provided by the present invention, the low-alloy high-strength steel of Q420B is produced.

[0043] Table 1 Product performance test table

[0044]

[0045] The rolling method provided by the present invention increases the originally planned arrangement quantity of 23-27 blocks to the current arrangement quantity of 37-43 blocks. At the same time, the average roll consumption is reduced by about 0.1mm, which greatly improves the service life of the rolls. Specifically, the roll loss of F1~F4 stands is reduced from 0.98mm in the original rolling cycle to 0.87mm at present; F5~F7 stands The loss of the roll has been reduced from the original 0.57mm to the current roll loss of 0.48mm.

[0046] The rolling proc...

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Abstract

The invention discloses a rolling process of low-alloy high-strength steel, and relates to the field of metal steel plate machining and forming. According to the rolling process, the strip steel threading and rolling stability is ensured through heating furnace temperature control, rolling channel heat preservation control, rough rolling material row control and finish rolling convexity plate shape control, rolling breakage and rolling rot are avoided, the defects of waste steel and roller damage are reduced, the roll shape is standard and neat, the structure property and the yield strength are good, the rolling stability and the product quality of the low-alloy high-strength steel thin specification are improved, and the risk of head and tail rolling rot is avoided. Through the rolling process, the rolling amount of the specification below 3.0mm reaches about 40 blocks, the head and tail rolling rot amount is controlled within 5%, industrial production of the low-alloy high-strength steel 2.3mm limit specification is conveniently achieved, and the market competitiveness is improved.

Description

technical field [0001] The invention relates to the technical field of processing and forming of metal steel plates, in particular to a rolling process of low-alloy high-strength steel. Background technique [0002] Low-alloy high-strength steel is one of the most widely used varieties of structural steel. It is widely used in high-rise steel structure buildings, bridges and driving beam structural parts, as well as high-strength parts in the fields of vehicles and machinery. Under the premise of meeting the requirements of plasticity, toughness and process performance, the performance of low alloy high strength steel is better than that of ordinary carbon decomposed structural steel. [0003] With the increasingly fierce competition in the hot-rolled coil market, it is the general trend to use microalloys such as niobium, vanadium and titanium to improve the performance of strip steel through solid solution strengthening and precipitation strengthening, thereby greatly redu...

Claims

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Application Information

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IPC IPC(8): B21B1/26B21B37/58B21B37/74B21B45/02B21B45/04B21C47/02
CPCB21B1/26B21B45/04B21B45/0203B21B37/74B21B37/58B21C47/02Y02P70/10
Inventor 裴振成康小兵张艳广张超田海军李志强张金强林成智
Owner TANGSHAN YANSHAN IRON & STEEL CO LTD
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