PN 系列钢制管法兰检测

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PNS 1423-1996锻合金钢.标准淬透性（H）系列和淬硬和回火至指定机械性能

This Standard specifies requirements for wrought alloy steels intended for general engineering purposes and is applicable to hot-rolled or cold-finished bars for machining, blooms, billets and slabs for forgings, and forgings.