Anti-collision pressure vessel steel for storing and transporting boron trifluoride and production method thereof

Anti-collision pressure vessel steel produced by using specific components and controlled rolling and cooling processes solves the safety problem of boron trichloride during transportation, achieving efficient energy absorption and material stability under collision conditions, thus ensuring transportation safety.

CN117551939BActive Publication Date: 2026-07-03武汉钢铁有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
武汉钢铁有限公司
Filing Date
2023-10-16
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies cannot effectively guarantee the safety of pressure vessels during the transportation of boron trichloride in the event of a collision, nor can they guarantee the dynamic yield strength and dynamic elongation after fracture of the material, which may lead to the risk of tank deformation, leakage and explosion.

Method used

The impact-resistant pressure vessel steel is produced using specific components and processes, including a reasonable ratio of elements such as C, Si, Mn, Al, V, and Nb. Through controlled rolling and controlled cooling processes, the microstructure is controlled to be ferrite + pearlite + bainite, ensuring a match between static and dynamic mechanical properties.

Benefits of technology

In the event of a collision, the steel plate can effectively absorb energy, prevent tank deformation and leakage, and ensure transportation safety. The dynamic yield strength and elongation after fracture are within a specific range, which improves the safety of transporting boron trichloride.

✦ Generated by Eureka AI based on patent content.

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Abstract

A collision-resistant pressure vessel steel for storing and transporting boron trifluoride, comprising the following components (wt%): C: 0.10–0.20%, Si: 0.20–0.40%, Mn: 1.25–1.70%, Al: 0.025–0.045%, P≤0.015%, S≤0.005%, V: 0.010–0.025%, Nb: 0.014–0.035%. The process involves: smelting, casting into a billet, heating the billet, rough rolling, finish rolling, cooling, normalizing, and stress relief. The static yield strength Rel of this invention is 350–430 MPa, and the dynamic yield strength Re is 470–675 MPa; the tensile strength is 510–580 MPa; the yield-to-tensile ratio is ≤0.85; and the static elongation after fracture A is 25–41% and the dynamic elongation after fracture A... d The strength-ductility product is 15950–22320 MPa·% at 30–39.1%; the drop hammer tear (DWTT) energy is 17–20 kJ; when the impact velocity is 5–50 m / s and the impact displacement is 1.5 m, the steel plate absorbs 2.70–3.20 kJ of energy, and the ferrite grain size does not exceed 0.029 μm.
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