Understanding 34CrMo4 Seamless Steel Tube in CNG Cylinder Manufacturing

When it comes to CNG cylinder manufacturing, the choice of raw material directly determines product safety and longevity. 34CrMo4 seamless steel tube has proven itself as the industry benchmark for high-pressure gas storage applications.

Precision-engineered specifications

Consider our 50-liter CNG cylinder as a prime example. Manufactured from premium 34CrMo4 seamless tubing, it features a 219mm outer diameter, 1620mm length, and weighs just 54.0kg. This lightweight yet robust design is achieved through careful material selection and precision cold-drawing processes that ensure consistent wall thickness throughout the tube length.

Built for rigorous duty

The material's exceptional mechanical properties come from its optimized chemical composition—chromium for hardenability and molybdenum for high-temperature strength. After quenching and tempering, 34CrMo4 delivers remarkable performance:

Working pressure: 200 bar

Test pressure: 300 bar (1.5 times working pressure)

Safety factor: 3.0 (typical for CNG cylinders)

Minimum tensile strength: 985 MPa

Certified reliability

Our 50L cylinder holds ECE R110 certification, the internationally recognized standard for CNG vehicle components. This certification validates that the 34CrMo4 steel's microstructure, toughness, and fatigue resistance meet the stringent requirements for automotive use. The material's fine grain structure and minimal internal defects ensure reliable performance across thousands of pressure cycles.

Why 34CrMo4 excels in CNG applications

Compared to alternative materials, 34CrMo4 offers superior resistance to hydrogen embrittlement and maintains mechanical properties across a wide temperature range (-40°C to +120°C). These characteristics make it the trusted choice for commercial vehicle fleets, transit buses, and industrial gas storage systems worldwide.

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