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

Production method of HRB400 steel bar for high speed railway

A high-speed railway and production method technology, applied in the field of metallurgy, can solve problems such as difficult to meet concrete simply supported beams, quality defects, etc., and achieve the effects of excellent welding performance, uniform structure, and high strength

Active Publication Date: 2018-12-28
LIUZHOU IRON & STEEL
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, there are the following problems in the prior art: the existing HRB400E hot-rolled ribbed steel bar has defects in quality, and it is difficult to meet the performance requirements of the standard for prefabricated post-tensioned prestressed concrete simply supported beams for high-speed railways

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

[0014] Embodiment 1: the production method of HRB400 steel bar for high-speed railway of the present invention comprises the following steps:

[0015] 1) Composition design and control of steel bar blanks (all components are mass fractions in the present invention): steel bar adopts vanadium nitrogen microalloying process, carbon: 0.21%~0.24%, silicon: 0.30%~0.60%, manganese: 1.30% ~1.50%, vanadium is controlled by combined addition of ferrovanadium, ferrovanadium nitride or vanadium-nitrogen alloy, vanadium: 0.030%~0.040%, nitrogen: 0.0070%~0.0100%; Make full use of the solid solution strengthening of silicon in the range of 0.30% to 0.60%, and add vanadium iron and vanadium iron nitride (or vanadium nitrogen alloy) according to the vanadium nitrogen ratio of 4:1 to ensure the vanadium carbonitride in the steel It is fully analyzed to improve the strength of the steel bar, maximize the nitrogen ratio of the bonded state of the steel bar, and minimize the strain aging sensitiv...

Embodiment 2

[0024] 1) Billet smelting component control (all components are mass fractions in the present invention): carbon: 0.22%, silicon: 0.49%, manganese: 1.34%, vanadium: 0.035%, nitrogen: 0.0086%, carbon equivalent: 0.46%;

[0025] 2) The heating time of the steel billet in the furnace is 70 minutes, using three-stage heating, the temperature of the soaking section is controlled at 1160°C, the rolling start temperature is controlled at 1040°C, and the tail of the steel bar is compensated for heating (the temperature of the tail is 30°C higher than that of other parts, for example 30°C above the head);

[0026] 3) The cooling water volume of each stand of the middle rolling and finishing rolling units is 86L / Min, the water pressure is 0.23MPa, and the gap between the inlet skirts of the cooling bed is 6mm;

[0027] 4) The steel bar is naturally cooled after rolling, without controlled cooling or water cooling, and the temperature of the upper cooling bed is 1025°C.

[0028] 5) Stee...

Embodiment 3

[0030] 1) Billet smelting component control (each component is the mass fraction in the present invention): carbon: 0.23%, silicon: 0.43%, manganese: 1.36%, vanadium: 0.035%, nitrogen: 0.0084%, carbon equivalent: 0.47%;

[0031] 2) The billet is heated in the furnace for 70 minutes, using three-stage heating, the temperature of the soaking section is controlled at 1152°C, the rolling start temperature is controlled at 1035°C, and the tail of the steel bar is compensated for heating (the temperature of the tail is 25°C higher than that of other parts);

[0032] 3) The cooling water volume of each stand of the intermediate rolling and finishing rolling mills is 90L / Min, the water pressure is 0.22MPa, and the gap between the inlet skirts of the cooling bed is 6mm;

[0033] 4) The steel bar is naturally cooled after rolling, without controlled cooling or water cooling, and the temperature of the upper cooling bed is 1020 °C.

[0034] 5) Steelmaking and rolling are controlled accor...

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
Yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for producing HRB400 steel bar for high-speed railway, comprising the following four steps. Step A, preparation of components: 0.21%-0.24% carbon, 0.30%-0.60% silicon,1. 30%-1.50% manganese, 0.030%-0.040% vanadium, 0.0070%-0.0100% nitrogen, the carbon equivalent of the steel bar being controlled to be below 0.48%. Step B, steel rolling billet is heated in the furnace for 60 to 90 minutes, the soaking zone temperature being controlled at 1150+ / -40 DEG C, the initial rolling temperature being controlled at 1030+ / -30 DEG C, and the tail temperature being 20 to 50DEG C. Step C, medium rolling and finishing mill. The cooling water volume of each rack is<=100L / Min, the water pressure being <=0.25MPa, and the gap of the cold bed inlet is adjusted to be more than5mm. Step D, natural cooling after rolling, no cooling control or water cooling, upper cooling bed temperature is 1000 to 1050 DEG C. The invention makes the steel bar have better structural uniformity, good welding performance and lower strain aging sensitivity.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for producing HRB400 steel bars for high-speed railways. Background technique [0002] China's railway industry has developed rapidly. For China's high-speed railway, its development achievements have been particularly remarkable in the past ten years. The operating mileage exceeds more than half of the world's total, and the four-vertical railway line has basically taken shape. At present, China's high-speed railway operation network is the largest in scale and the fastest in operation in the world. The concept of replacing roads with bridges is one of the main strategies for China's high-speed railway construction. The bridge mileage of China's high-speed railway accounts for 82% of the line mileage, and the concrete simply supported box girder bridges with common spans (32 meters and 24 meters) account for the total bridge mileage. The proportion of mileage is basically abo...

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): C22C38/02C22C38/04C22C38/12C21D8/08
CPCC21D8/08C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/12
Inventor 何维邓深甘贵平樊雷钱学海陈利苏捷杰
Owner LIUZHOU IRON & STEEL
Features
  • Generate Ideas
  • 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