12 Inch Stainless Steel Pipe
Stainless steel 347 is variation of the fundamental austenitic 18/8 Grade 304 with included Columbium – the presentation of Columbium balances out the steel and wipes out carbide precipitation which accordingly causes intergranular consumption. They are suggested for parts created by welding which can't be accordingly tempered. These sorts likewise are utilized for parts which are discontinuously warmed and cooled to temperatures somewhere around 800°F and 1600°F. The expansion of columbium creates a stabilized sort of stainless that disposes of carbide precipitation and, thus, intergranular consumption.
FEATURES OF STAINLESS STEEL 347/347H:
o Superior general corrosion resistance over Type 321 due to stabilization with columbium.
o Reduced tendencies to form continuous networks of chromium carbides at the grain boundaries.
o Better high temperature properties than 304 or 304L. Generally used for parts which are intermittently heated up to 1500°F. For continuous service the maximum temperature is 1650°F.
o Type 347 has high carbon (.04 to .10) for better high temperature creep properties.
o Improved intergranular corrosion resistance.
APPLICATIONS OF STAINLESS STEEL 347/347H:
o High temperature chemical processes
o Heat exchanger tubes
o High temperature steam service
o High pressure steam pipes
o Radiant super heaters
o Boiler tubes
o Heavy duty exhaust systems
o General refinery piping
CHEMICAL COMPOSITION OF 12 Inch Stainless Steel Pipe:
C | Cr | Mn | Ni | P | S | Si | Cb/Ta | |
347 | 0.08 max | min: 17.0 | 2.0 max | min: 9.0 | 0.04 max | 0.30 | 0.75 | min:10x C |
347H | min: 0.04 | min: 17.0 | 2.0 max | min: 9.0 | 0.03 max | 0.30 | 0.75 | min:10x C |
MECHANICAL PROPERTIES OF 12 Inch Stainless Steel Pipe:
Grade | Tensile Strength ksi (MPa) min | Yield Strength 0.2% ksi offset ksi (MPa) min | Elongation (% in 50mm) min | Hardness (Brinell) MAX | Hardness (Rockwell B) MAX |
347/347H | 75 | 30 | 40 | 201 | 95 |
PHYSICAL PROPERTIES OF 12 Inch Stainless Steel Pipe:
Density | Coefficient of | Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm -°F | Modules of Elasticity (annealed)2-psi | |
at 68 °F | at 68 – 212°F | at 68 – 1832°F | 68-932°F | at 32 – 212°F | in tension (E) |
0.288 | 9.2 | 11.4 | 14.7 | 0.12 | 28 x 106 |
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