PURPOSE: To manufacture a high Cr seamless steel pipe of high quality by supplying a ferrous oxide setting an iron oxide as a main component on a plug surface for punch from a billet side.
CONSTITUTION: A hollow base stock is adjusted by applying hot punch to a high Cr steel billet by using a lug for punch. The high Cr seamless steel pipe is manufactured by rolling such hollow base stock. The ferrous oxide setting the iron oxide (FeO) as the main component is supplied from the billet side to the surface of the plug for punch. Also, the ferrous oxide is supplied to the end face on the side where the punch of the billet is started by performing build up welding on a carbon steel plate or carbon steel mounted by bonding. In this way, it is possible to reduce a manufacturing cost, to improve pipe manufacturing efficiency, to improve the internal body of a rolled pipe, and to improve the quality of a product.
JPH02206693 | LUBRICANT FOR HOT WORKING |
JPH0699206 | INCLINING ROLLING METHOD FOR SEAMLESS STEEL TUBE |
KURIKI YOSHIRO
MINAMI YUSUKE
HATANAKA MASAYUKI