Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Production process of small low-alloy Q355B angle steel

A technology of Q355B and production process, which is applied in the field of production process of small low-alloy Q355B angle steel, can solve the problems such as toughness is difficult to guarantee, and achieve the effect of low requirements for rolling equipment and rolling process, excellent welding performance and guaranteed strength

Active Publication Date: 2022-01-14
ANYANG IRON & STEEL
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a relatively cheap alloying element, Ti microalloy can produce a strong precipitation strengthening effect in steel, and has a wide range of applications, but the related patents are all related to the production technology of medium and thick plates and coils
There is no relevant patented technology and application of titanium-strengthened angle steel in the production of profiles. The main problem is that toughness is difficult to guarantee.

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
  • Production process of small low-alloy Q355B angle steel
  • Production process of small low-alloy Q355B angle steel
  • Production process of small low-alloy Q355B angle steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A titanium-strengthened low-alloy Q355B angle steel, its chemical composition and the mass fraction of each composition are shown in Table 1, and the rolling specification is ∠75×75×6. In the heating process, the continuous casting slab adopts cold charging, the heating temperature is 1230°C, the time in the furnace is 105min, and the temperature of the continuous casting slab is 1083°C; the rolling process, the rolling temperature is 1062°C, and the first stand The rolling mill reciprocated rolling for 4 passes, the second rolling mill reciprocated rolling for 5 passes, and the subsequent 5 stands The rolling mills each rolled one pass, the final rolling temperature was 923°C, the cooling rate of the cooling bed was 2.0°C / s, and the temperature of the lower cooling bed was 465°C. The mechanical properties of the titanium-strengthened low-alloy Q355B angle steel prepared in this example are shown in Table 2.

[0022] The metallographic photo of this embodiment Q355B ...

Embodiment 2

[0024] A titanium-strengthened low-alloy Q355B angle steel, its chemical composition and the mass fraction of each composition are shown in Table 1, and the rolling specification is ∠75×75×8. Continuous casting slab reheating process, continuous casting slab adopts cold charging, heating temperature 1210 ℃, furnace time 112min, continuous casting slab exit temperature 1053 ℃; rolling process, rolling start temperature 1038 ℃, the first stand 4 passes in the rolling mill, 5 passes in the second rolling mill, and 5 subsequent passes The rolling mills each rolled one pass, the final rolling temperature was 935°C, the cooling rate of the cooling bed was 1.8°C / s, and the temperature of the lower cooling bed was 489°C. The mechanical properties of the Q355B angle steel prepared in this example are shown in Table 2, and the metallographic structure is similar to Example 1.

Embodiment 3

[0026] A titanium-strengthened low-alloy Q355B angle steel, its chemical composition and the mass fraction of each composition are shown in Table 1, and the rolling specification is ∠75×75×10. Continuous casting slab reheating process, continuous casting slab adopts cold charging, heating temperature 1170°C, furnace time 121min, continuous casting slab exit temperature 1023°C; rolling process, rolling start temperature 1018°C, first stand 4 passes in the rolling mill, 5 passes in the second rolling mill, and 5 subsequent passes The rolling mills each rolled one pass, the final rolling temperature was 916°C, the cooling rate of the cooling bed was 1.6°C / s, and the temperature of the lower cooling bed was 521°C. The mechanical properties of the Q355B angle steel prepared in this example are shown in Table 2, and the metallographic structure is similar to Example 1.

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
Yield strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a production process of small-sized low-alloy Q355B angle steel. The chemical components of the Q355B angle steel are different from those of the high Mn design of traditional low-alloy Q355B angle steel. A single Ti microalloy element is added in the production process, the precipitation strengthening effect of Ti is utilized, the solution strengthening of Mn of the traditional Q355B angle steel is partially replaced, and the toughness is ensured in cooperation with a rolling process of low-temperature finish rolling. According to the low-alloy Q355B angle steel produced through the method, the thickness ranges from 6 mm to 10 mm, the yield strength ranges from 350 MPa to 460 MPa, the tensile strength ranges from 500 MPa to 600 MPa, the elongation ranges from 25% to 35%, and the impact energy at the temperature of 20 DEG C is larger than 50 J; and the metallographic structure of the steel is a polygonal ferrite and blocky pearlite structure, and the pearlite is uniformly distributed in a free state.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material engineering, and relates to a production process of small-sized low-alloy Q355B angle steel. Background technique [0002] Low-alloy Q355B angle steel belongs to low-alloy high-strength structural steel. In use, it is required to have good weldability, plastic deformation performance and certain mechanical strength. The chemical composition design of the traditional small low-alloy Q355B angle steel adopts a composition system of 0.15-0.20% C and 1.20-1.60% Mn, and the solid solution strengthening of Mn is mainly used to ensure the strength of the steel. [0003] In recent years, with the development of the oversupply situation in the steel industry, the market competition has become more intense, and manufacturers have also taken reducing production costs as the main management direction. As a relatively cheap alloying element, Ti microalloy can produce a strong precipitation st...

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
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/14B21B1/46B21C37/02
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/14C22C38/001B21B1/46B21C37/02
Inventor 何晓波欧阳瑜韦弦赵祥梅温斌李静宇张振申贺瑞飞刘社牛李娜柴垚董尉民贾黎杰霍桂兰
Owner ANYANG IRON & STEEL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com