GB 6653 gas cylinder steel plates and strips are steel designed for manufacture of welded gas cylinders. The hot rolled GB 6653 gas cylinder steel plates and strips thickness range is 2-14mm, and the cold rolled GB 6653 gas cylinder steel plates and strips thickness range is 1.5-4mm. GB 6653 technical standard specifies the size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of HP235 steel, HP265 steel, HP295 steel, HP325 steel, HP345 steel plates and strips for welded gas cylinders. Hot rolled GB 6653 gas cylinder steel plates and strips shall be delivered in hot rolled, controlled rolled or heat treated condition. After negotiation between the supplier and the demander and indicated in the contract, hot rolling and pickling can be carried out. Cold rolled GB 6653 gas cylinder steel plates and strips are delivered in annealed condition.