What is the difference between 347H austenitic stainless steel and TP347H?

What is the difference between 347H austenitic stainless steel and TP347H?

 

347H is the American standard ASTM executive standard steel grade. It is an austenitic stainless hot-strength steel. Because it contains chromium Cr, nickel Ni, and niobium Nb, it has good intergranular corrosion resistance and polysulfate intergranular stress corrosion resistance, and has high temperature strength. And plasticity, good weldability, this steel has higher high temperature strength and high temperature oxidation resistance than 316, so it is often used as a heat-strength steel. Common specifications include hot-rolled thin plates, medium-thick open flat plates, hot-rolled round steel, smooth round bars, etc.

Corresponding national brand number: 1Cr19Ni11Nb
Taiyuan Iron & Steel Co., Ltd. implementation standard: ASTM A240/A240M-2019
Chemical composition: Carbon C:0.04~0.10
Manganese Mn:≤2.00
Silicon Si:≤1.00
Chromium Cr:17.00~19.00
Nickel Ni:9.00~12.00
Phosphorus P:≤0.045
Sulfur S:≤0.030
Niobium Nb:≤1.10

Mechanical properties:

Yield strength Rp0.2 (MPa): ≥205

Tensile strength PM (MPa): ≥515

Elongation A (%): ≥30

Area shrinkage (%): ≥40

use:

Commonly used in large boiler superheaters, reheaters, steam pipes, petrochemical heat exchanger pipe fittings, etc.