A kind of production method of round steel for ultra-high strength bolts

A production method and ultra-high-strength technology, applied in the direction of improving process efficiency, can solve the problems that are not involved, and achieve the effects of improving density and composition segregation, refining grains, and reducing delayed fracture

Active Publication Date: 2020-11-03
山东寿光巨能特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art does not involve the production of round steel with a tensile strength requirement > 1400MPa and used on 14.9-grade ultra-high-strength bolts

Method used

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  • A kind of production method of round steel for ultra-high strength bolts
  • A kind of production method of round steel for ultra-high strength bolts
  • A kind of production method of round steel for ultra-high strength bolts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]The properties of the Φ31mm rolled products produced by continuous casting rectangular billets with a section of 150mm×150mm all meet the technical requirements. The specific process method is as follows:

[0031] (1) Using 45t molten iron and steel scrap as raw materials, using ultra-high power eccentric bottom electric furnace for smelting: in the electric furnace smelting process, use 50% molten iron + scrap steel raw material ratio to explore the electric furnace smelting, control the C content wt≥0.06 in tapping %, P content wt≤0.010% in tapping; add SiCaBaAl 1.0kg / t and steel core aluminum 1.5kg / t for strong deoxidation when tapping 15t, then add ferroalloy material, recarburizer, and slag into the ladle, and use Strong argon stirring to uniform temperature and composition, and promote the deoxidation product to float;

[0032] (2) Refining materials with LF refining furnace; the refining furnace uses calcium carbide and silicon carbide to diffuse and deoxidize in...

Embodiment 2

[0045] The properties of the Φ34mm rolled products produced by continuous casting rectangular billets with a cross-section of 150mm×150mm all meet the technical requirements. The specific process method is as follows:

[0046] (1) Using 45t of high-quality molten iron as the main raw material, using an ultra-high-power eccentric bottom-type electric furnace for smelting: in the electric furnace smelting process, molten iron is used for electric furnace smelting, the tapping control C content wt is 0.08%, and the tapping P content wt≤0.010% ; Add SiCaBaAl 1.2kg / t and steel core aluminum 2.0kg / t for strong deoxidation when tapping 18t, then add ferroalloy material, recarburizer, and slag into the ladle, and use argon gas to stir strongly in the later stage of tapping to uniform temperature and composition , and promote the deoxygenation product to float;

[0047] (2) Refining the material with LF refining furnace; in the early stage of the refining furnace, calcium carbide and ...

Embodiment 3

[0059] The properties of the Φ38mm rolled products produced by continuous casting rectangular billets with a section of 150mm×150mm all meet the technical requirements. The specific process method is as follows:

[0060] (1) Using molten iron and steel scrap as raw materials, using ultra-high power eccentric bottom electric furnace for smelting: in the electric furnace smelting process, the raw material ratio of 70% molten iron + scrap steel is used to explore the electric furnace smelting, and the tapping control C content wt ≥ 0.06% , P content wt≤0.010% in tapping; add SiCaBaAl 1.0~1.5kg / t and steel core aluminum 1.5~2.5kg / t for strong deoxidation when tapping 15~20t, ferroalloy material, recarburizer and slag are then added to the ladle In the later stage of tapping, strong argon stirring is used to uniform temperature and composition, and to promote the deoxidation product to float;

[0061] (2) Refining the material with LF refining furnace; in the early stage of refini...

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Abstract

The invention discloses a production method of round steel for ultrahigh-strength bolts. The method comprises the following steps of (1) using molten iron and waste steel as raw materials, smelting byusing an ultrahigh-power eccentric bottom type electric furnace, (2) refining by using an LF refining furnace, (3) degassing by using a VD vacuum furnace, and feeding a cored wire, (4) carrying out continuous casting treatment by adopting an arc-shaped continuous casting machine, (5) rolling steel, (6) cogging, (7) pushing a steel heating furnace to perform steel billet heating, (8) stacking andslow cooling, (9) and carrying out heat treatment. According to the production method of round steel for ultrahigh-strength bolts, a more optimized heat treatment process is adopted, so that the mechanical property of products can better meet the requirements of high strength and high toughness of the products.

Description

technical field [0001] The invention relates to the technical field of round steel production, in particular to a method for producing round steel for ultra-high-strength bolts. Background technique [0002] In recent years, with the rapid development of my country's automobile, wind power, machinery, construction, light industry and other industries, higher requirements have been put forward for the materials used in the manufacture of various fasteners (such as bolts, nuts, etc.). It requires higher strength and better impact toughness. At present, grade 10.9 bolts have been widely used, but the requirement that the tensile strength is only 1000MPa can no longer meet the requirements of some industries, especially the automotive industry with lightweight design, and the wind power industry. For this reason, higher strength products are required, such as tensile strength requirements> 1400MPa. However, the prior art does not involve the production of round steel with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/06C21C7/10B22D11/115C21D8/06
CPCB22D11/115C21C7/10C21D8/065C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24Y02P10/20
Inventor 刘发友朱卫东尚明刘勇丁秀中李宝忠于洪波孙正炜刘蕾刘洁刘世义高文娟徐志刚刘杰光孙建设高连亮
Owner 山东寿光巨能特钢有限公司
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