JIS B2312-2009《钢制对焊管配件》

This Standard specifies the steel and nickel-chromium ferro-alloy seamless pipe fit-
tings to be fitted by butt-welding, mainly to pressure service pipings 11, high pressure
service pipings , high temperature service pipings , alloy steel pipings , stainless steel
pipings, low temperature service pipings and steel pipes for fired heaters (here-
after referred to as "pipe fittings").
The special quality specification, a part of or all of which may be designated by the
a greement between the purchaser and the manufacturer, is given in .Annex.J.A.. a.nd the
requirements of special pttinge are specified in Aneex JB: The shapes and
dimensions of special bevel ends are described in Annex JC for informative reference.

NOTE : The International Standards corresponding to this Standard and the sym-
bol of degree of correspondence are as follows.
ISO 3419 : 1981 Non-alloy and alloy steel butt-welding fittings
ISO 5251 : 1981 Stain