Supercharge Your Innovation With Domain-Expert AI Agents!

Low-nitrogen ultrahigh-strength hot rolled steel strip with thickness of 4-10 mm and production method thereof

A production method and ultra-high-strength technology, applied in the field of steel strip rolling, can solve the problems of poor process adaptability, high alloy cost and process cost, etc., and achieve the effects of good strength and toughness matching, promotion of development and promotion, and low production cost.

Active Publication Date: 2022-02-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that most of the existing 900-1000MPa ultra-high strength hot-rolled steels are heat-treated steels, the alloy cost and process cost remain high, and the process adaptability is poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-nitrogen ultrahigh-strength hot rolled steel strip with thickness of 4-10 mm and production method thereof
  • Low-nitrogen ultrahigh-strength hot rolled steel strip with thickness of 4-10 mm and production method thereof
  • Low-nitrogen ultrahigh-strength hot rolled steel strip with thickness of 4-10 mm and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The chemical composition is calculated by weight percentage (%): C 0.12, Si 0.29, Mn 1.90, P 0.009, S 0.002, Als 0.023, N 0.0028, Cr 0.22, Ti 0.17, V 0.09, Mo 0.17, through smelting and low temperature constant speed Casting, 230mm thick steel slab was obtained after putting into 5mm light reduction, the slab heating temperature was 1273°C, the rough rolling cumulative compression ratio was 4.3, the rough rolling exit temperature was 1045°C, the thickness of the intermediate slab after rough rolling was 54mm, and the finishing rolling cumulative compression ratio was 9 , the finish rolling entrance temperature is 1003°C, the finish rolling finish temperature is 861°C, the steel plate thickness after finish rolling is 6mm, the laminar cooling rate is 41°C / s, and the finish cooling temperature is 573°C.

[0047] The yield strength of the finished steel is 897MPa, the tensile strength is 973MPa, the elongation is 18.5%, the 180° cold bending d=2a is qualified, the microstru...

Embodiment 2

[0049] The chemical composition is calculated by weight percentage (%): C 0.14, Si 0.25, Mn 1.85, P 0.011, S 0.003, Als 0.035, N 0.0024, Nb 0.039, Ti 0.17, V 0.08, Mo 0.16, through smelting and low temperature constant speed Casting, 200mm thick steel slab was obtained after putting into 5mm light reduction, the slab heating temperature was 1259°C, the rough rolling cumulative compression ratio was 4.3, the rough rolling exit temperature was 1100°C, the thickness of the intermediate slab after rough rolling was 47mm, and the finishing rolling cumulative compression ratio was 5.9 , the finish rolling entrance temperature is 1020°C, the finish rolling finish temperature is 900°C, the steel plate thickness after finish rolling is 8mm, the laminar cooling rate is 36°C / s, and the finish cooling temperature is 619°C.

[0050] The yield strength of the finished steel is 945MPa, the tensile strength is 1006MPa, the elongation is 19%, the 180° cold bending d=2a is qualified, the microst...

Embodiment 3

[0052] The chemical composition is calculated by weight percentage (%): C 0.16, Si 0.27, Mn 1.95, P 0.010, S 0.004, Als 0.041, N 0.0018, V 0.10, Ti 0.17, Ni 0.22, Mo 0.15, through smelting and low temperature constant speed Casting, 250mm thick steel slab was obtained after putting into 5mm light reduction, the slab heating temperature was 1268°C, the rough rolling cumulative compression ratio was 5, the rough rolling exit temperature was 1091°C, the thickness of the intermediate billet after rough rolling was 50mm, the finishing rolling cumulative compression ratio was 6.3, the finishing rolling The rolling entrance temperature is 1011°C, the finishing rolling temperature is 930°C, the steel plate thickness after finishing rolling is 8mm, the laminar cooling rate is 50°C / s, and the finishing cooling temperature is 603°C.

[0053] The yield strength of the finished steel is 961MPa, the tensile strength is 1032MPa, the elongation is 17%, the 180° cold bending d=2a is qualified, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a low-nitrogen ultrahigh-strength hot rolled steel strip with the thickness of 4-10 mm and a production method thereof. The steel strip comprises 0.10%-0.20% of C, 1.80%-2.00% of Mn, 0.25%-0.35% of Si, smaller than or equal to 0.020% of P, smaller than or equal to 0.008% of S, 0.020%-0.050% of Als, smaller than or equal to 0.0030% of N, 0.15%-0.20% of Ti, at least two of V, Nb, Mo, Cr and Ni and the balance Fe and inevitable impurities. V + Ti + Nb is less than or equal to 0.30%, and Cr + Mo + Ni is less than or equal to 0.50%. The method comprises the steps of molten iron pre-desulfurization, converter smelting, LF refining, RH vacuum refining, calcium treatment, continuous casting, hot rolling and laminar cooling. Titanium microalloying is adopted, the nitrogen content is reduced to control liquidation of titanium nitride, the high-strength hot rolled steel is obtained through precipitation strengthening and fine grain strengthening, heat treatment is not needed, and the production cost is low.

Description

technical field [0001] The invention relates to a low-nitrogen ultra-high-strength hot-rolled steel strip with a thickness of 4-10 mm and a production method thereof, belonging to the technical field of steel strip rolling. Background technique [0002] The number of domestic automobiles has long been ranked first in the world, which also brings huge challenges to energy conservation and emission reduction. In order to reduce energy consumption and reduce carbon emissions, high-strength and lightweight is the only way for the development of the passenger car and commercial vehicle industry. The survey found that the mainstream hot-rolled automotive structural steel in the market is currently switching from 600MPa to 700MPa. However, the market demand is endless, and some users report that they have higher lightweight requirements. At present, most of the 900-1000MPa ultra-high-strength hot-rolled steels on the market are heat-treated steels, and the alloy cost and process c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/06C22C38/50C22C38/46C22C38/48C22C38/44C22C33/06B21B1/46C21D8/02B21B37/74
CPCC22C38/58C22C38/02C22C38/06C22C38/50C22C38/46C22C38/48C22C38/44C22C33/06B21B1/463C21D8/0205C21D8/0226B21B37/74C21D2211/005Y02P10/20
Inventor 熊雪刚张开华陈述汪创伟崔凯禹李正荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com