China Manufacturer Supply High Quality Seamless Steel Gas Cylinder. High-Strength Alloy Steel: Made from 34CrMo4/30CrMo/37Mn steel for superior strength and durability. ISO9809 Compliance: Strictly produced in accordance with ISO9809 international safety standards. High-Pressure Resilience: Works at 150/200 Bar, tested at 250-300 Bar for ultimate safety. Customizable Colors: Available in standard colors or customized as per client request. Versatile Applications: Suitable for Chemical, Medical, New Energy, and Petroleum industries. OEM & ODM Support: Accepts logo, color, and appearance size customization.