摘要:
A piercing and rolling plug has a film composed of oxides such as Fe3O4 and FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this film, a plug excellent in heat-shielding and seizure-preventing effects can be realized and the lifetime of the plug can be prolonged. Further, in regenerating this plug, a film can be re-formed via the steps of shot blasting of the as-used plug in piercing and rolling and electric arc spraying in that order; thus, it is possible to regenerate the plug at low cost and in a short period of time.
摘要翻译:穿孔滚动塞具有由氧化物如Fe 3 O 4和FeO和Fe(金属)构成的膜,其通过使用主要成分为Fe的铁丝通过电弧喷涂形成在母材表面上,并且由于该膜 能够实现优良的隔热防止效果的塞子,延长塞子的使用寿命。 此外,在再生该插头时,可以通过以下步骤重新形成薄膜:依次进行穿孔和滚压以及电弧喷涂中使用的插头的喷丸处理; 因此,可以在低成本和短时间内再生插头。
摘要:
A piercing and rolling plug has a film composed of oxides such as Fe3O4 and FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this film, a plug excellent in heat-shielding and seizure-preventing effects can be realized and the lifetime of the plug can be prolonged. Further, in regenerating this plug, a film can be re-formed via the steps of shot blasting of the as-used plug in piercing and rolling and electric arc spraying in that order; thus, it is possible to regenerate the plug at low cost and in a short period of time.
摘要翻译:穿孔滚动塞具有由氧化物如Fe 3 O 4和FeO和Fe(金属)构成的膜,其通过使用主要成分为Fe的铁丝通过电弧喷涂形成在母材表面上,并且由于该膜 能够实现优良的隔热防止效果的塞子,延长塞子的使用寿命。 此外,在再生该插头时,可以通过以下步骤重新形成薄膜:依次进行穿孔和滚压以及电弧喷涂中使用的插头的喷丸处理; 因此,可以在低成本和短时间内再生插头。
摘要:
Disclosed is a method for producing a seamless pipe by using a piercing mill which pierces and rolls a round billet heated to 1300° C. or lower, wherein the piercing mill is composed of a pair of skew rolls disposed to face each other around a pass line, a pair of guide devices disposed to face each other around the pass line, and a plug disposed along the pass line, between the pair of the skew rolls and also between the pair of the guide devices, wherein the piercing-rolling is performed under the conditions satisfying the following formulas (1) to (3) to prevent wrinkle flaws of the seamless pipe: −1.0
摘要:
Martensitic stainless steel tubes are produced by optimizing the chemical composition of steel for billets (C: 0.15-0.22%, Si: 0.1-1.0%, Mn: 0.10-1.00%, Cr: 12.00-14.00%, N: 0.01-0.05%, P: not more than 0.020% and S: not more than 0.010%) and the relation between the soaking temperature for pierced-and-rolled tubing material and the section area reduction rate in final rolling. By this method, delayed fracture cracking in impact-receiving portions of tubes in martensitic stainless steel s such as 13% Cr tubes can be inhibited and the generation of inner-surface flaws can be prevented.