Stainless Steel 347H Fittings Supplier and Exporter

Solitaire Overseas is a trusted supplier of SS 347H Fittings of ASTM standards and also an exporter of global standards. We stock all the standard forms and sizes of ASTM A403WP347H and ASTM A182F347H buttweld fittings and forged fittings. The most stringent specification in the niobium stabilised stainless steel family is SS 347H (UNS S34709 / DIN 1.4961). The 347 grade contains a controlled range of carbon (0.04 to 0.10%) as compared to standard SS 347 Fittings, that allow carbon up to 0.08%. The mandatory minimum carbon provides a great improvement in creep and stress-rupture properties above 550°C and sensitisation resistance is still maintained through the use of niobium stabilisation. For allowable stress (higher temperatures) with sensitisation resistance, ASME Boiler and Pressure Vessel Code prefers 347H. They are included in our Stainless Steel Fittings range from our Stainless Steel Products inventory.

Table of Contents

SS 347H Fittings Specification

ParameterDetails
GradeStainless Steel 347H / UNS S34709
DIN / Werkstoff Nr.1.4961
EN DesignationX8CrNiNb16-13
Buttweld StandardASTM A403 WP347H / ASME SA403 WP347H
Forged StandardASTM A182 F347H / ASME SA182 F347H
Dimension Standard (BW)ASME B16.9 / MSS SP-43
Dimension Standard (Forged)ASME B16.11 / MSS SP-79
Forms AvailableElbow, Tee, Reducer, Cap, Stub End, Lap Joint, Cross, Coupling, Half-Coupling, Union, Plug, Bushing, Insert
Size Range (BW)1/2 inch NB to 48 inch NB
Size Range (Forged)1/8 NPS to 4 NPS | Class 2000 / 3000 / 6000 / 9000
Schedule RangeSCH 5S / 10S / 40S / 80S / 160 / XXS
End TypesBeveled End (BE), Plain End (PE), Threaded End (TE)
Test CertificatesEN 10204 3.1 MTC (standard); 3.2 on request
Third-Party InspectionSGS / TUV / Bureau Veritas / Intertek (on request)
PMI TestingAvailable on request
Surface FinishPickled, Annealed, Polished (2B, No.4, Mirror) on request
OriginIndia / Japan / Europe (to be confirmed at order stage)
DeliveryReady stock for common sizes; custom: 4 to 8 weeks

SS 347H vs SS 347 vs SS 321H Grade Comparison

The table below is mandatory reading for any buyer selecting within the stabilised stainless steel family. It separates 347H from its sister grades and from SS 347/347H Pipes and SS 347/347H Tubes product families that share the same base metallurgy.

PropertySS 347H (this page)SS 347SS 321H
Carbon Range0.04 to 0.10%0.08% max0.04 to 0.10%
Stabilising ElementNiobium (Nb)Niobium (Nb)Titanium (Ti)
Creep Strength > 550 CSuperior (controlled C)StandardSuperior (controlled C)
Weld Deposit StabilisationYes - Nb retainedYes - Nb retainedNo - Ti lost to arc
ASME BPV Code High-Temp UsePreferredLimited high-temp allowablePreferred

Types of Stainless Steel 347H Fittings

ASTM A182 SS 347 _ 347H Forged 45 Degree Elbow

ASTM A182 SS 347 _ 347H Forged 45 Degree Elbow

ASTM A182 SS 347 _ 347H Forged 90 Degree Elbow

ASTM A182 SS 347 _ 347H Forged 90 Degree Elbow

ASTM A182 SS 347 _ 347H Forged Socket Weld Cross

ASTM A182 SS 347 _ 347H Forged Socket Weld Cross

ASTM A182 SS 347 _ 347H Forged Socket Weld Tee

ASTM A182 SS 347 _ 347H Forged Socket Weld Tee

ASTM A182 SS 347 _ 347H Socket Weld Cap

ASTM A182 SS 347 _ 347H Socket Weld Cap

ASTM A182 SS 347 _ 347H Threaded _ Screwed Bushing

ASTM A182 SS 347 _ 347H Threaded _ Screwed Bushing

ASTM A182 SS 347 _ 347H Threaded _ Screwed Hex Plug

ASTM A182 SS 347 _ 347H Threaded _ Screwed Hex Plug

ASTM A182 SS 347 _ 347H Threaded _ Screwed Union

ASTM A182 SS 347 _ 347H Threaded _ Screwed Union

ASTM A182 SS 347 Forged Socket Weld Full Coupling

ASTM A182 SS 347 Forged Socket Weld Full Coupling

ASTM A182 SS 347 Forged Socket Weld Half Coupling

ASTM A182 SS 347 Forged Socket Weld Half Coupling

ASTM A182 SS 347 Threaded _ Screwed Pipe Nipple

ASTM A182 SS 347 Threaded _ Screwed Pipe Nipple

ASTM A182 SS 347 Threaded _ Screwed Street Elbow

ASTM A182 SS 347 Threaded _ Screwed Street Elbow

ASTM A403 WP347 _ 347H SS 45° Elbow

ASTM A403 WP347 _ 347H SS 45° Elbow

ASTM A403 WP347 _ 347H SS 90° Elbow

ASTM A403 WP347 _ 347H SS 90° Elbow

ASTM A403 WP347 _ 347H SS 180° Elbow

ASTM A403 WP347 _ 347H SS 180° Elbow

ASTM A403 WP347 _ 347H SS Concentric Reducer

ASTM A403 WP347 _ 347H SS Concentric Reducer

ASTM A403 WP347 _ 347H SS Eccentric Reducer

ASTM A403 WP347 _ 347H SS Eccentric Reducer

ASTM A403 WP347 _ 347H SS End Pipe Cap

ASTM A403 WP347 _ 347H SS End Pipe Cap

ASTM A403 WP347 _ 347H SS Equal Cross

ASTM A403 WP347 _ 347H SS Equal Cross

ASTM A403 WP347 _ 347H SS Equal Tee

ASTM A403 WP347 _ 347H SS Equal Tee

ASTM A403 WP347 _ 347H SS LR Elbow

ASTM A403 WP347 _ 347H SS LR Elbow

ASTM A403 WP347 _ 347H SS Reducing Tee

ASTM A403 WP347 _ 347H SS Reducing Tee

ASTM A403 WP347 _ 347H SS SR Elbow

ASTM A403 WP347 _ 347H SS SR Elbow

ASTM A403 WP347 _ 347H SS Stub End

ASTM A403 WP347 _ 347H SS Stub End

Need SS 347H Fittings for your project?

Solitaire Overseas stocks standard sizes for immediate dispatch. Send your size, schedule, grade, quantity, and inspection requirement for a fast quote with MTC availability and delivery timeline.

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Chemical Composition of SS 347H Fittings

GradeCCrNiNb+TaMnSiP / S
SS 347H0.04 to 0.10%17.0 to 19.0%9.0 to 13.0%8xC min to 1.10% max2.0% max1.0% max0.045 / 0.030% max

Mechanical Properties of SS 347H Fittings (Annealed Condition)

PropertySeamlessWeldedForged
Tensile Strength (min)515 MPa / 75 ksi515 MPa / 75 ksi515 MPa / 75 ksi
Yield Strength 0.2% (min)205 MPa / 30 ksi205 MPa / 30 ksi205 MPa / 30 ksi
Elongation (min)35%35%35%
Hardness (max)201 HB / 92 HRB201 HB / 92 HRB201 HB / 92 HRB

Application Industries of SS 347H Fittings

  • Oil & Gas Industry
  • Chemical Industry
  • Petrochemical
  • Power Industry
  • Construction
  • Fertilizers Industry
  • Automotive Industry
  • Food And Beverage Industry

Complementary product families include SS Pipes, SS Tubes, and SS Flanges.

Equivalent Grades of Stainless Steel 347H Fittings

STANDARDWERKSTOFF NR.UNSJISGOSTEN
SS 347H1.4961S34709SUS 347H-X6CrNiNb18-12

Dimensions Standard Of Stainless Steel 347H Fitting

NB (MM)NPS (Inch)O.D. Y (MM)Wall Thickness T (MM)ScheduleLR 45° Elbow Center-Face B (MM)LR 45° Weight (KG)LR 90° Elbow Center-Face A (MM)LR 90° Weight (KG)SR 90° Elbow Center-Face A (MM)SR 90° Weight (KG)
151/221.32.78STD15.90.0438.10.08--
151/221.33.73XS15.90.0538.10.10--
203/426.72.87STD11.10.0428.60.08--
203/426.73.91XS11.10.0528.60.11--
25133.43.38STD22.20.0938.10.1525.40.11
25133.44.55XS22.20.1138.10.1925.40.14
321 1/442.23.56STD25.40.1447.60.2831.750.18
321 1/442.24.85XS25.40.2047.60.3931.750.24
401 1/248.33.68STD28.60.2057.10.4038.10.26
401 1/248.35.08XS28.60.2557.10.5038.10.35
50260.33.91STD34.90.3676.20.7250.80.50
50260.35.54XS34.90.5076.21.0050.80.68
652 1/273.05.16STD44.40.7395.21.4663.50.95
652 1/273.07.01XS44.40.9195.21.8263.51.27
80388.95.49STD50.81.10114.32.1876.21.45
80388.97.62XS50.81.45114.32.8676.21.95
1004114.36.02STD63.52.10152.44.20101.62.80
1004114.38.56XS63.52.90152.45.70101.63.90
1255141.36.65STD79.43.40190.06.80127.04.80
1255141.39.50XS79.45.00190.010.00127.06.50
1506168.37.11STD95.25.10229.010.10152.46.80
1506168.310.97XS95.27.70229.015.30152.410.20

Size of Stainless Steel 347H Fittings

NPS (Inch)Pipe ScheduleOD (Inch)Wall Thickness (Inch)Allowable Stress 100200300400500
1401.3150.13322052205220520471902
1801.3150.17930613061306128412640
11601.3150.25044934493449341703874
1 1/2401.9000.14516291629162915121404
1 1/2801.9000.20023032303230321381986
1 1/21601.9000.28133623362336231202899
2402.3750.15413711371137112721182
2802.3750.21819851985198518431712
21602.3750.34432833283328330472831
3403.5000.21613011301130112081122
3803.5000.30018441844184417121590
31603.5000.43827872787278725872403
4404.5000.2371102110211021023950
4804.5000.33715961596159614821377
41604.5000.53126112611261124242252
5405.5630.258965965965896832
5805.5630.37514281428142813251231
51605.5630.62524742474247422962133

Weight Chart of Stainless Steel 347H Fittings

Normal Pipe SizeABQtyWeight (KG)
1/40.810.881600.20
3/80.971.001300.26
1/21.121.311000.57
3/41.311.50750.71
11.501.81401.08
1 1/41.752.19251.68
1 1/22.002.44182.38
22.382.97103.55
2 1/23.003.6246.22
33.384.31210.36
44.195.75123.91

Pressure Rating of Stainless Steel 347H Fittings

Temperature (°F)Temperature (°C)Class 150Class 300 (1/4"-1")Class 300 (1 1/4"-2")Class 300 (2 1/2"-3")
-20 to 150-29 to 66300200015001000
2009326517851350910
25012122515751200825
30014918513601050735
3501771501150900650
400204-935750560
450232-725600475
500260-510450385
550288-300300300

Frequently Asked Questions

SS 347H has a controlled minimum carbon of 0.04% (versus 0.08% max for standard 347), ensuring superior creep and stress-rupture strength above 550 C. Both grades are niobium-stabilised for sensitisation resistance. Specify 347H when ASME B&PV Code requires elevated-temperature allowable stresses higher than permitted for standard 347.

ASTM A403 WP347H covers buttweld fittings; ASTM A182 F347H covers forged fittings. ASME equivalents are SA403 WP347H and SA182 F347H for pressure code applications.

SS 347H uses niobium stabilisation, which is retained in weld deposits when using ER347 filler wire. SS 321H uses titanium, which is lost to the weld arc, producing an unstabilised weld deposit. For nuclear service, where both high-temperature creep properties and stabilised weld deposits are required, 347H is preferred over 321H.

ASTM requires a minimum carbon of 0.04% for SS 347H. This minimum is mandatory. A heat with carbon below 0.04% does not qualify as 347H. Always verify the minimum carbon on the MTC before accepting material.

Yes. Solitaire Overseas supplies SS 347H fittings with ASME SA403 WP347H / SA182 F347H certification, EN 10204 3.1 MTCs, PMI testing, and third-party inspection on request.

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