Causes of ASTM A139 Grade E steel pipe pitting:
1, ASTM A139 Grade E steel pipe in the heat treatment caused by excessive thickness of the oxide sheet, in the straightening of the oxide sheet pressed into peeling after the production of pitting.
2. There is dirt in the residual iron oxide or saponification solution after pickling, which produces pitting after pulling.
3. After pickling ASTM A139 Grade E steel pipe, parking time is too long, resulting in rust surface.
4. There is oil on the surface of the ASTM A139 Grade E steel pipe steel pipe, and the oil points coalesce during heat treatment and burn into a pockmarked surface when heated.
Methods of ASTM A139 Grade E steel pipe pitting prevention:
1. Correctly implement the heat treatment system when loading the furnace.
2. Stick to quick turnarounds.
3, Pickling can not be too washing, do not owe washing, pickling after timely drawing.
