CN-121496295-B - B-containing high-strength stainless steel for highway guardrails and preparation method thereof

Abstract

The invention discloses a B-containing high-strength stainless steel for highway guardrails and a preparation method thereof, belonging to the technical field of stainless steel manufacturing processes; the stainless steel comprises the following chemical components: 0.10% < C≤0.18%; si is more than or equal to 0.35% and less than or equal to 0.7%; mn is more than or equal to 9% and less than or equal to 15%; cr is more than or equal to 12.5% and less than or equal to 15%; ni is more than or equal to 0.5% and less than 1.0%; n is more than or equal to 0.2% and less than or equal to 0.3%; cu is more than or equal to 0.4% and less than or equal to 1.0%; b is more than or equal to 0.004% and less than or equal to 0.010%; p is less than or equal to 0.010 percent; s is less than or equal to 0.010 percent, and the balance is Fe; smelting raw materials in a vacuum induction furnace, casting into an ingot, and homogenizing, forging and rolling the ingot; the stainless steel has excellent mechanical properties, and can meet the requirements of highway guardrail steel without subsequent heat treatment; the material is applied to highway guardrails, and the higher yield strength, the elongation and the good corrosion resistance of the material can realize the light weight of the guardrail plates; solves the problem that the mechanical property and the corrosion resistance of the stainless steel for the highway guardrail can not be considered.

Inventors

• YANG JIANMIN
• WANG ZHIHAO
• MENG ZIQIAN
• Rong Ruihao
• GAO YANG
• LI BAO
• YUAN JINXI
• ZHAO YAN
• LI PEIXUAN
• ZHAO WENBIN
• LV SHUYUN
• YU XIAOFANG

Assignees

• 山西路安交通科技有限公司
• 临汾北高速公路管理有限公司

Dates

Publication Date

20260505

Application Date

20260113

Claims (9)

1. 1. The hot rolled stainless steel plate for the highway guardrails contains 0.14% of C, 0.55% of Si, 10% of Mn, 13.5% of Cr, 0.95% of Ni, 0.25% of N, 0.7% of Cu, 0.0050% of B, less than or equal to 0.010% of P, less than or equal to 0.010% of S, and the balance of Fe and other unavoidable impurity elements.
2. 2. The hot rolled steel sheet for highway guardrails containing B high strength stainless steel according to claim 1, wherein the matrix structure of the stainless steel is an austenite structure, and the carbides are dispersed in the hot rolled state.
3. 3. The hot rolled sheet of B-containing high strength stainless steel for highway guardrails according to claim 2, wherein the thickness of the stainless steel for highway guardrails is 2.0mm-2.8mm, the room temperature yield strength is more than 500MPa, the tensile strength is more than 1000MPa, and the elongation after break is more than 35%.
4. 4. A method for producing a B-containing high strength stainless steel hot rolled sheet for highway guardrails according to any one of claims 1 to 3, characterized in that the raw materials are smelted in a vacuum induction furnace, cast into ingots, and the ingots are homogenized, forged and rolled to obtain the stainless steel.
5. 5. The method for preparing the B-containing high-strength stainless steel hot rolled plate for the highway guardrail according to claim 4, wherein the homogenization is to heat an ingot to 1100 ℃ plus or minus 50 ℃ along with a furnace, and keep the temperature for 1-3 h.
6. 6. The method for producing a hot rolled steel sheet for highway guardrails containing B high strength according to claim 5, wherein said forging is to forge the homogenized ingot into a slab.
7. 7. The method for producing a hot rolled steel sheet for highway guardrails containing B high strength according to claim 6, wherein the final forging temperature of forging is controlled to be 900 ℃ or higher, and then air-cooled to room temperature.
8. 8. The method for producing a hot rolled steel sheet for highway guardrails containing B high strength stainless steel according to claim 7, wherein the rolling is to heat the forged slab to 1050.+ -. 50 ℃ in a furnace and roll the slab into a sheet by a two-roll hot rolling mill.
9. 9. The method for producing a hot rolled steel sheet for highway guardrails containing B high strength stainless steel according to claim 8, wherein the rolling finishing temperature is controlled to be 900 ℃ or higher, and then cooled to room temperature by water.

Description

B-containing high-strength stainless steel for highway guardrails and preparation method thereof Technical Field The invention belongs to the technical field of stainless steel manufacturing processes, and particularly relates to B-containing high-strength stainless steel for highway guardrails and a preparation method thereof. Background The highway crash barrier absorbs unexpected collision energy through plastic deformation of the waveform barrier material, plays a role in buffering and guiding, and can protect vehicles and passengers and reduce accident loss. The higher the yield strength of the highway guardrail steel is, the larger the elongation after fracture is, and the better the guardrail buffering guiding effect is. However, generally, the higher the yield strength of the steel is, the lower the elongation after fracture is, so that components and processing technology are required to be regulated to balance the strength and the plasticity of the material, and the requirement of highway guardrail steel is met. In addition, along with the development of building a green traffic system, higher requirements are also put forward on the corrosion resistance of guardrail steel, the service life of the material can be prolonged due to the high corrosion resistance, the thickness and the consumption of steel can be reduced, and the realization of light weight and cost reduction is facilitated. The national standard documents GB/T31439.1-2015 section 1 of the waveform beam steel guardrail and GB/T31439.2-2015 section 2 of the waveform beam steel guardrail are that the main mechanical property assessment indexes of the road waveform beam steel guardrail are that the lower yield strength is not less than 235MPa, the tensile strength is not less than 375MPa and the elongation after break is not less than 26%. The vast majority of traditional highway guardrails adopt carbon steel Q235, and this material intensity is lower, needs to use thicker material to satisfy the intensity requirement, has stipulated among the above-mentioned two national standard documents that current guardrail wave form beam slab's thickness standard is 3mm or 4mm, and the material consumption is big, and is with high costs, if the impact force that receives of guardrail is too big, then unable effective protection vehicle and passenger. In addition, the Q235 has weak corrosion resistance to conditions such as snow melting salt, industrial atmosphere and the like, the surface of the Q235 can be applied only by galvanizing, and the galvanizing cost is high and has the environmental protection problem. Therefore, the development of the high-strength corrosion-resistant stainless steel suitable for the highway guardrails has important significance for promoting the highway construction and the safety development in China. In order to improve the mechanical strength and corrosion resistance of a metal material and meet the urgent requirements of upgrading and reforming the safety performance of a highway crash barrier and building a green traffic system in the prior art, weather-resistant steel and stainless steel are generally adopted as matrixes, the mechanical performance and corrosion resistance of the highway crash barrier are improved by adding rare earth elements or a coating method, and CN202211360251.1 discloses a high-strength weather-resistant steel for the highway crash barrier and a preparation method of the highway crash barrier, wherein the surface of the high-strength weather-resistant steel is provided with a galvanized aluminum coating to improve the weather resistance, and the preparation process is complicated and has higher cost. CN202011384068 discloses a low-alloy high-strength high-weather-resistance structural steel for highway guardrails, mechanical properties are improved by adding rare earth element Nb, material cost is increased, and the material only considers atmospheric corrosion resistance, so that the application scene is limited. CN202310513235.X discloses a low-chromium ferrite stainless steel for highway guardrails and a preparation method thereof, wherein the material matrix becomes a ferrite and martensite complex phase structure by optimizing alloy components, controlling rolling process parameters and carrying out high-strength continuous annealing heat treatment, but the corrosion resistance of the material is reduced due to the existence of martensite. The prior art can not meet the requirements that the stainless steel has higher yield strength and elongation after fracture and also has higher corrosion resistance. Therefore, development of a novel high-strength economical stainless steel for highway guardrails is required. Disclosure of Invention The invention overcomes the defects of the prior art, provides the B-containing high-strength stainless steel for the highway guardrails and the preparation method thereof, and solves the problems that the stainless steel for the highway guardrails in