What is 1.7335 alloy heat-resistant steel pipe

1.7335 (13CrMo4-5) is a chromium-molybdenum alloy heat-resistant steel in accordance with the German DIN standard. It is designed for high temperature and high pressure environments and is widely used in energy and chemical equipment manufacturing.

Chemical composition (wt.%)

• Element Content range Functional description
• Carbon (C) 0.08–0.18 Balance strength and weldability
• Chromium (Cr) 0.70–1.15 Improve corrosion resistance and high temperature strength
• Molybdenum (Mo) 0.40–0.60 Enhance creep resistance
• Manganese (Mn) 0.40–1.00 Improve work hardening ability
• Impurities Phosphorus/Sulfur ≤0.035 Control brittleness

Core performance

• High temperature stability: long-term working temperature ≤500℃, excellent creep resistance
• Mechanical strength: quenched and tempered tensile strength 450–600 MPa, yield strength ≥300 MPa
• Process adaptability: supports welding (needs preheating above 250°C) and heat treatment

Typical applications

• Energy equipment: boiler tubes, turbine rotors
• Chemical industry: high-pressure reaction vessels, petroleum cracking units
• Machinery manufacturing: high-temperature fasteners, vibration plate components

International equivalent grades

• China GB: 15CrMo
• US AISI: 4118
• Japan JIS: SCM415