321 UNS S32100 347 UNS S34700 321H 347H Stainless steel
Chemical Composition:(WT%)
|
Element
|
Weight Percentage Maximum
|
|
|
|
Unless Range is Specified
|
|
|
|
321
|
347
|
|
Carbon*
|
0.08
|
0.08
|
|
Manganese
|
2.00
|
2.00
|
|
Phosphorus
|
0.045
|
0.045
|
|
Sulfur
|
0.030
|
0.030
|
|
Silicon
|
0.75
|
0.75
|
|
Chromium
|
17.00-19.00
|
17.00-19.00
|
|
Nickel
|
9.00-12.00
|
9.00-13.00
|
|
Columbium + Tantalum**
|
--
|
10xC min to 1.00 max
|
|
Tantalum
|
--
|
--
|
|
Titanium**
|
5x(C+N) min to 0.70 max
|
--
|
|
Cobalt
|
--
|
--
|
|
Nitrogen
|
0.10
|
--
|
|
Iron
|
Balance
|
Balance
|
|
|
*Also H grade with Carbon 0.04 – 0.10%.
|
|
|
|
**H grade minimum stabilizer is different formula.
|
|
AVAILABLE SIZES:
Cold-rolled Steel Sheet(Thickness*Width*Length/mm):
Cold-rolled Steel Sheet(Thickness*Width*Length/mm):
|
321/321H
|
347/347H
|
|
0.4-3.0×1000/1219×2000/2438
|
0.4-3.0×1000/1219×2000/2438
|
|
0.4-3.0×1000/1219×C
|
0.4-3.0×1000/1219×C
|
Hot-rolled Stainless Steel Plate (Thickness*Width*Length/mm):
|
321/321H
|
347/347H
|
|
3-6×1250/1500×6000
|
3-6×1250/1500×6000
|
|
8-20×1500/1800×6000
|
8-20×1500/1800×6000
|
|
22-100×1800/2000×6000
|
22-100×1800/2000×6000
|
|
3-6×1250/1500×C
|
3-6×1250/1500×C
|
STANDARDS:
ASTM A240, ASME SA240,
EN10028-7, JIS G 4304, GB/T4237
ASTM A240, ASME SA240,
EN10028-7, JIS G 4304, GB/T4237
DESCRIPTION:
Alloys 321 and 347 offer similar resistance to general, overall corrosion as the unstabilized chromium nickel Alloy 304. Heating for long periods of time in the chromium carbide precipitation range may affect the general resistance of Alloys 321 and 347 in severe corrosive media.
High carbon versions of both alloys are available. These grades have UNS designations S32109 and S34709.
Alloys 321 and 347 offer similar resistance to general, overall corrosion as the unstabilized chromium nickel Alloy 304. Heating for long periods of time in the chromium carbide precipitation range may affect the general resistance of Alloys 321 and 347 in severe corrosive media.
High carbon versions of both alloys are available. These grades have UNS designations S32109 and S34709.
DESIGN FEATURES:
• Immune to intergranular corrosion when
heated within the carbide precipitation range.
• Titanium addition eliminates the formation of
chromium carbides at the grain boundaries by
tying up the carbon and nitrogen as titanium
carbides or nitrides.
Better high temperature properties than 304 or
304L. Generally used for parts which are intermittently heated up to 1500 deg.F. For
continuous service the alloy is good to 1650 deg.F.
• May be susceptible to chloride stress cracking.
• Excellent weldability in field.
High carbon Alloys 321H and 347H (UNS32109 and S34700, respectively) have higher strength at temperatures above 1000°F (537°C). ASME maximum allowable design stress data for Alloy 347H reflects the higher strength of this grade in comparison to the lower carbon Alloy 347 grade. The Alloy 321H is not permitted for Section VIII applications and is limited to 800°F (427°C) use temperatures for Section III code applications.
• Immune to intergranular corrosion when
heated within the carbide precipitation range.
• Titanium addition eliminates the formation of
chromium carbides at the grain boundaries by
tying up the carbon and nitrogen as titanium
carbides or nitrides.
Better high temperature properties than 304 or
304L. Generally used for parts which are intermittently heated up to 1500 deg.F. For
continuous service the alloy is good to 1650 deg.F.
• May be susceptible to chloride stress cracking.
• Excellent weldability in field.
High carbon Alloys 321H and 347H (UNS32109 and S34700, respectively) have higher strength at temperatures above 1000°F (537°C). ASME maximum allowable design stress data for Alloy 347H reflects the higher strength of this grade in comparison to the lower carbon Alloy 347 grade. The Alloy 321H is not permitted for Section VIII applications and is limited to 800°F (427°C) use temperatures for Section III code applications.
TYPICAL APPLICATIONS:
High temperature chemical process heat exchanger tubes Refineries High temperature steam service, In general, Alloys 321 and 347 are used for heavy welded equipment which cannot be annealed and for equipment which is operated between 800°F to 1500°F (427°C to 816°C) or slowly cooled through this range.
High temperature chemical process heat exchanger tubes Refineries High temperature steam service, In general, Alloys 321 and 347 are used for heavy welded equipment which cannot be annealed and for equipment which is operated between 800°F to 1500°F (427°C to 816°C) or slowly cooled through this range.