Niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H-shaped steel and rolling method thereof

An economical, high-strength technology, applied in metal rolling, temperature control, metal rolling, etc., to achieve high weather resistance, simple metallurgical composition, and low alloying production costs

Inactive Publication Date: 2010-06-16
MAANSHAN IRON & STEEL CO LTD
View PDF0 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, based on the hot-rolled H-beam rolling process, using V and Nb micro-alloying technology to produce high-strength weather-resistant hot-rolled H

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]The mass percentage (wt%) of the chemical composition of molten steel is: C: 0.07; Si: 0.39; Mn: 1.51: P: 0.024; S: 0.002; Cu: 0.25; Cr: 0.26; 0.04: Als: 0.015.

[0023] H-beam rolling process parameters are: billet soaking temperature 1220°C; billet opener start rolling temperature 1120°C; billet opener finish rolling temperature 1000°C; universal rough rolling mill start rolling temperature 940°C; universal finishing mill finish rolling temperature 845°C ℃; the total reduction rate in the universal rolling area is ≥50%.

[0024] The performance index of H-shaped steel (600mm×200mm×11mm×17mm) is: R eL 495MPa, R m 605MPa, A is 26%, -40°C longitudinal A KV It is 285J, the actual grain size is 10.0, and the relative corrosion rate is 52.3% of that of Q345B steel.

Embodiment 2

[0026] The mass percentage (wt%) of the chemical composition of molten steel is: C: 0.09; Si: 0.48; Mn: 1.43; P: 0.038; S: 0.003; Cu: 0.28; Cr: 0.27; 0.05: Als: 0.026.

[0027] H-beam rolling process parameters are: billet soaking temperature 1225°C; billet opener rolling temperature 1125°C; billet finisher finish rolling temperature 1010°C; universal rough rolling mill start rolling temperature 940°C; universal finishing mill finish rolling temperature 855°C ℃; the total reduction rate in the universal rolling area is ≥50%.

[0028] The performance index of H-shaped steel (600mm×200mm×11mm×17mm) is: R eL 490MPa, R m 595MPa, A is 27%, -40°C longitudinal A KV It is 225J, the actual grain size is 9.5, and the relative corrosion rate is 54.3% of Q345B steel.

Embodiment 3

[0030] The mass percentage (wt%) of the chemical composition of molten steel is: C: 0.11; Si: 0.44; Mn: 1.39; P: 0.029; S: 0.008; Cu: 0.33; Cr: 0.24; 0.03; Als: 0.008.

[0031] The H-beam rolling process parameters are: billet soaking temperature 1195°C; billet opener start rolling temperature 1105°C; billet opener finish rolling temperature 980°C; universal rough rolling mill start rolling temperature 915°C; universal finishing mill finish rolling temperature 815°C ℃; the total reduction rate in the universal rolling area is ≥50%.

[0032] The performance index of H-shaped steel (630mm×200mm×13mm×20mm) is: R eL is 475MPa, R m 575MPa, A is 29%, -40°C longitudinal A KV It is 214J, the actual grain size is 10.0, and the relative corrosion rate is 53.8% of that of Q345B steel.

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
Yield strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H-shaped steel, which is characterized by comprising the following chemical compositions in percentage by weight: 0.07 to 0.12 percent of C, 0.30 to 0.55 percent of Si, 1.30 to 1.55 percent of Mn, 0.020 to 0.045 percent of P, 0.001 to 0.010 percent of S, 0.25 to 0.35 percent of Cu, 0.20 to 0.30 percent of Cr, 0.15 to 0.30 percent of Ni, 0.04 to 0.08 percent of V, 0.02 to 0.05 percent of Nb, 0.006 to 0.030 percent of Als and the balance of Fe and residual trace impurities. The invention also discloses a rolling method for the H-shaped steel, wherein the soaking temperature of a casting blank is 1,195 to 1,225 DEG C; the start rolling temperature of a breaking down mill is 1,100 to 1,150 DEG C; the finish rolling temperature of the breaking down mill is 980 to 1,030 DEG C; the start rolling temperature of a universal roughing mill is 900 to 950 DEG C; the finish rolling temperature of the universal roughing mill is 800 to 870 DEG C; and a control total rolling reduction rate of a universal rolling area is more than or equal to 50 percent. By the method, the hot rolled H-shaped steel with high strength, high toughness, high weather resistance and good welding performance can be prepared. At the same time, because the steel has simple metallurgic components, relatively low alloying production cost, economy and practicability, the hot rolled H-shaped steel is the ideal hot rolled H-shaped steel used for manufacturing railway vehicles, freight semi-trailers and other industrial facilities needing the high-strength and high-weather-resistance steel.

Description

technical field [0001] The invention relates to the field of low-alloy steel, in particular to an economical high-strength and high-weather resistance hot-rolled H-shaped steel and a rolling method thereof. Background technique [0002] High-strength weather-resistant steel refers to weather-resistant steel with a yield strength ≥ 450 MPa. This type of steel is mainly used in the manufacture of special containers, bridges and high-speed train carriages. aspects play an important role. Especially with the rapid development of the national economy, the railway transportation industry is moving towards high-speed passenger transportation and heavy-duty freight transportation, and there is an urgent need for hot-rolled H-beams with high strength, high toughness and high weather resistance. Since high weathering steel requires high weather resistance, high strength level, excellent low temperature impact toughness and welding performance, it requires high level of metallurgical ...

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): C22C38/58C22C38/48B21B37/74B21B37/16
Inventor 吴结才汪开忠孙维程鼎吴坚吴保桥
Owner MAANSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap