... /A333 GR6/X42/X46/X52//X56/X6010#,20# and 45# is also acceptable Specification range: OD: ... 8/ST45.8/ST44/ST45/52, JIS and so on, and also develop new products according to the ... our clients. Application: Seamless steel pipes for low and medium pressure boiler, high pressure boiler, ship-building, ... cracking, chemical fertilizer equipment, electric power,drawing-oil-equipment and structure purposes.