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

Spring steel and manufacturing and thermal treatment method thereof

A heat treatment method and spring steel technology, applied in temperature control, electric furnace, furnace, etc., can solve the problems of low production efficiency, large thermal stress, increased process and energy consumption, and achieve high production efficiency, strong cold forming ability, and reduced The effect of process and energy consumption

Inactive Publication Date: 2013-07-31
BAOSTEEL SPECIAL STEEL CO LTD
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) High carbon content (0.56-0.64% C), high steel strength (tensile strength ≥ 1600Mpa), low toughness and plasticity (section reduction rate ≥ 30%);
[0005] (2) The traditional spring steel smelting adopts aluminum deoxidation and high-basicity slag vacuum refining technology, and the brittle inclusions Al in the steel 2 o 3 It is not easy to float and remove, and the gas content is high;
[0006] (3) Due to the high carbon content, the steel is highly sensitive to decarburization during rolling and thermal processing, the decarburization layer is thick (1.5% D), and the fatigue life of the fastener is low during use;
[0007] (4) Since the carbon content of the traditional spring steel is as high as 0.54-0.64%, the steel is hard, and the user needs to heat and then heat form it during use. At the same time, due to the high carbon content, the thermal stress in the quenching and tempering process is large. Water medium can cause stress cracks in steel, oil quenching and oil tempering must be used, which increases the process and energy consumption, and the production efficiency is low

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
  • Spring steel and manufacturing and thermal treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] The present invention will be described through examples below, and it should be noted that these examples are only exemplary and do not constitute any limitation to the present invention.

[0046] Preparation of spring steel

[0047] The chemical composition of embodiment and comparative example is shown in Table 1, and its preparation process is as follows:

[0048] The first step, electric arc furnace smelting - ladle refining - continuous casting pouring

[0049] Primary smelting of molten steel in a 60-ton electric arc furnace; refining in a 60-ton ladle; continuous casting; production of 90×90mm 2 ~360×360mm 2 Qualified continuous casting slabs with section dimensions:

[0050] (1) Initial smelting: Low P and S scrap steel, cut ends and high-quality pig iron are used as charge materials; low-carbon chromium, low-carbon manganese, etc. should be prepared for alloys; reducing agent: calcium carbide, carbon powder, crystalline silicon, etc.; oxidation period: freq...

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
tensile strengthaaaaaaaaaa
reduction of areaaaaaaaaaaa
reduction of areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a spring steel, which comprises the following components in percentage by mass: 0.3 to 0.5 percent of C, 1.0 to 2.5 percent of Si, 0.3 to 1.5 percent of Mn, 0.1 to 1.0 percent of Cr, 0.01 to 0.30 percent of Ni, less than or equal to 0.15 percent of Cu, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities, wherein the spring steel can be manufactured into high-speed railway rail buckles by a processing method of cold forming. The invention also discloses a manufacturing and thermal treatment method of the spring steel. By the method, the yield strength (Rm) of the spring steel is more than or equal to 1,000MPa, the tensile strength (Rp0.2) is more than or equal to 1,200MPa, the elongationrate (A) is more than or equal to 6 percent, the section shrinkage rate (Z) is more than or equal to 30 percent, and the buckle requirements of high-speed railway rails are met.

Description

technical field [0001] The invention belongs to the technical field of manufacturing and processing of ferrous metal materials, and in particular relates to a spring steel in the metallurgical industry and a manufacturing method thereof. The spring steel can be used to manufacture high-speed railway track fasteners. Background technique [0002] Before the domestic high-speed railway speeds up, the train speed is 120-180 km / h, and the spring steel of railway track fasteners is mainly designed with high-carbon chemical composition, such as C 0.56-0.64%, Si 1.60-2.00%, Mn 0.70- 1.00%, Cr≤0.35%, Ni≤0.25%, P≤0.025%, S≤0.0250%, the manufacturing process is usually: primary refining→LF refining (high alkalinity slag, aluminum deoxidation)→VD refining→continuous casting→ Heating→rolling→testing→qualified warehousing→use by users using hot coil spring forming→quenching and tempering with oil quenching and oil tempering. This spring steel has a certain strength (tensile strength ≥ 16...

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 Patents(China)
IPC IPC(8): C22C38/42C22C38/40C21C7/06C21C5/52B21B37/74
CPCY02P10/20
Inventor 顾文俊张成名王凯张建平马宝国
Owner BAOSTEEL SPECIAL STEEL CO LTD
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