Regarding the meanings of the letters in A182 TP347
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In austenitic stainless steel A182 TP347, the “A” denotes austenitic stainless steel; does anyone know what “TP” stands for? Thank you
TP stands for piping, which is the first letter of the English words TUBE & PIPE
×× – Commonly used terms include TP, GRADE (Gr), TYPE (T), WC, CLASS (CL), F, etc. Their meanings are as follows: TP – heat-resistant stainless steel; WC – weldable cast steel; GRADE – categories based on chemical composition; F – forgings; TYPE – types based on chemical composition; CLASS – categories based on composition or strength; T – small-diameter pipes; P – large-diameter pipes, etc.
A does not stand for austenitic stainless steel; A182 refers to the standard number in ASME, and TP is the first letter of TUBE PIPE.
A182 is an ASME category for steel materials, corresponding to ASTM’s SA182; it refers to forged and rolled alloy steels for high-temperature use, with others classified under other categories.
A182 forged alloy steel is generally denoted as ASTM A182-F； ASTM A182-F11 ； ASTM A182-F22 ； ASTM A182-F5 ； ASTM A182-F9: the suffixes -F, -F11, F22, F5, F9 indicate the material composition (mainly Cr and Mo); TP347 is equivalent to 18Cr-10Ni-Nb, which is a forged material
What is the difference in heat resistance between adding Nb and adding Ti?
There shouldn’t be much difference, but the allowable stress of TP321 at 700 degrees Celsius is only about half that of stainless steels like 304.
I have a question: What do the letters in pipe grade A53F stand for? Thanks.