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347H stainless steel coiled tubing

Stainless steels are high-alloy steels which have high corrosion resistance than other steels owing to the presence of large amounts of chromium in the range of 4 to 30%. Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. In addititon, they form another group known as precipitation-hardened steels, which are a combination of martensitic and austenitic steels.

347H stainless steel coiled tubing

The following datasheet will provide more details about grade 347H stainless steel, which is slightly tougher than grade 304 steel.

347H stainless steel coiled tubing

The following table shows the chemical composition of grade 347H stainless steel.

347H stainless steel coiled tubing

Element Content (%)
Iron, Fe 62.83 – 73.64
Chromium, Cr 17 – 20
Nickel, Ni 9 – 13
Manganese, Mn 2
Silicon, Si 1
Niobium, Nb (Columbium, Cb) 0.320 – 1
Carbon, C 0.04 – 0.10
Phosphorous, P 0.040
Sulfur, S 0.030

Physical Properties

347H stainless steel coiled tubing

The physical properties of grade 347H stainless steel are given in the following table.

Properties Metric Imperial
Density 7.7 – 8.03 g/cm3 0.278 – 0.290 lb/in³

347H stainless steel coiled tubing

Mechanical Properties

The mechanical properties of grade 347H stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength, ultimate 480 MPa 69600 psi
Tensile strength, yield 205 MPa 29700 psi
Rupture strength (@750°C/1380°F, time 100,000 hours) 38 – 39 MPa, 5510 – 5660 psi
Elastic modulus 190 – 210 GPa 27557 – 30458 ksi
Poisson’s ratio 0.27 – 0.30 0.27 – 0.30
Elongation at break 29% 29%
Hardness, Brinell 187 187

Other designations that are equivalent to grade 347H stainless steel include the following:

  • ASTM A182
  • ASTM A213
  • ASTM A240
  • ASTM A249
  • ASTM A271
  • ASTM A312
  • ASTM A336
  • ASTM A376
  • ASTM A403
  • ASTM A430
  • ASTM A479
  • ASTM A813
  • ASTM A814
  • SAE 30347H

 


Post time: Jul-01-2023