Development of 26Cr1Mo Ultra-Corrosion-Resistant Ferritic Stainless Steel for Offshore PV Support Structures

Zou Yong; Zhang Shoulu; Hao Wenhui; Liu Lei; Wang Bin; Pei Mingde

doi:10.20057/j.1003-8620.N260122

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Development of 26Cr1Mo Ultra-Corrosion-Resistant Ferritic Stainless Steel for Offshore PV Support Structures

更新时间：2026-10-22

- Development of 26Cr1Mo Ultra-Corrosion-Resistant Ferritic Stainless Steel for Offshore PV Support Structures
- Special Steel Pages: 1-7(2026)
- 作者机构：
  
  1.太原钢铁（集团）有限公司先进不锈钢全国重点实验室，太原 030003
  2.山西太钢不锈钢股份有限公司技术中心，太原 030003
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N260122
  CLC： TG142.7
- Received：02 August 2026，
  
  Revised：2026-08-21，
  
  Accepted：28 August 2026，
  
  Online First：21 September 2026，
- 稿件说明：
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邹勇,张寿禄,郝文慧等.海上光伏支架用26Cr1Mo超耐蚀铁素体不锈钢开发[J].特殊钢,

Zou Yong,Zhang Shoulu,Hao Wenhui,et al.Development of 26Cr1Mo Ultra-Corrosion-Resistant Ferritic Stainless Steel for Offshore PV Support Structures[J].Special Steel,
邹勇,张寿禄,郝文慧等.海上光伏支架用26Cr1Mo超耐蚀铁素体不锈钢开发[J].特殊钢, DOI：.

Zou Yong,Zhang Shoulu,Hao Wenhui,et al.Development of 26Cr1Mo Ultra-Corrosion-Resistant Ferritic Stainless Steel for Offshore PV Support Structures[J].Special Steel, DOI：.

摘要

针对海上光伏支架高盐腐蚀工况下镀锌钢材耐蚀不足、含镍不锈钢成本偏高的行业难题，设计了无镍高铬钼超低碳氮铁素体不锈钢26Cr1Mo。通过Cr、Mo主耐蚀合金搭配少量Cu提升钝化膜稳定性，添加Ti、Nb稳定化元素固定钢中C、N，有效抑制贫铬区的形成，降低不锈钢晶间腐蚀敏感性；通过“转炉、VOD真空脱碳、LF精炼、控温热轧与连续退火工艺”，规避σ、Laves、α' 等析出相。试验确定最优退火制度为980～1 000 ℃、保温8 min、水冷，力学性能满足抗拉强度≥550 MPa、屈服强度≥350 MPa、伸长率≥25%的设计要求。腐蚀性能测试表明，26Cr1Mo晶间腐蚀速率仅0.12 mm/a、模拟海水临界点蚀温度72.4 ℃、应力腐蚀试验120 h无裂纹。该不锈钢不含贵金属镍，在保障优异耐海水腐蚀的同时有效控制生产成本，对推进海上光伏产业发展、落实“双碳”目标具备工程价值。

Abstract

To address the industrial challenges of insufficient corrosion resistance of galvanized steel and the high cost of nickel-containing stainless steel under high-salinity corrosive conditions for offshore photovoltaic brackets， a nickel-free ferritic stainless steel， 26Cr1Mo， with ultra-low carbon and nitrogen and high chromium and molybdenum contents， is developed in this work. Cr and Mo are adopted as primary corrosion-resistant alloying elements with a small amount of Cu added to enhance the stability of passive film. The composite addition of Ti and Nb stabilizes carbon and nitrogen atoms in the steel， inhibits the formation of chromium-depleted zones along grain boundaries and reduces the intergranular corrosion susceptibility. An integrated manufacturing route including BOF， VOD， LF， temperature-controlled hot rolling and continuous annealing is applied to prevent the precipitation of brittle phases such as σ phase， Laves phase and α' phase. Heat treatment tests identify the optimal annealing schedule： water cooling after holding at 980 ℃–1 000 ℃ for 8 min. The mechanical properties meet design targets： tensile strength ≥550 MPa， yield strength ≥350 MPa and elongation ≥25%. Corrosion tests reveal that the intergranular corrosion rate of 26Cr1Mo is only 0.12 mm/a， its critical pitting temperature in simulated seawater reaches 72.4 ℃， and no cracks are observed after a 120 h stress corrosion test. Free of precious metal nickel， this steel achieves superior seawater corrosion resistance with controlled production cost. It possesses prominent engineering application value for promoting the large-scale development of offshore photovoltaic industry and achieving the goals of carbon peaking and carbon neutrality.

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