How are the characteristics of stainless steel fittings affected by cold or hot working?

These fittings are ubiquitous in industrial applications, including petrochemicals, gas processing, and nuclear power plants. Stainless steel pipe fittings can undergo hot or cold working per client requirements.

As a rule of thumb, cold working renders the material stronger but at the cost of ductility. In contrast, hot working leads to reduced strength due to austenitization.
Considering the stainless steel grade of the fittings is vital. For example, Grade 304 cannot get hardened by heat treatment.

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Stainless steel pipe fittings manufacturer in India

What are the general steps involved in the installation process of stainless pipe fittings?

The installation depends on the type of fittings. For instance, socket-weld fittings don’t need bevelled pipe ends and are straightforward to weld. However, stainless steel welded fittings(buttweld) need a skilled technician.

The standard approach is arc welding while keeping distance from any non-metallic materials and using correct temperatures (around 60 °C). Pickling and passivation are recommended after welding.

Stockist of stainless pipe fittings like SS elbow and tee that have been finished and certified as per ASTM A403

Stainless steel pipe fittings

Stainless steel pipe fittings

Stainless steel fittings

Stainless steel fittings

Stainless pipe fittings

Stainless pipe fittings

What are the typical tests conducted on SS pipe fittings?

These fittings undergo a thorough visual inspection, destructive tests, NDT or non-destructive testing, and macro/micro analysis. Stainless steel fittings generally undergo a burst test, besides assessments of the tensile strength and impact resistance. Hydrostatic and Charpy V-Notch tests may also get performed if the customer requests.

NDT procedures usually include ultrasonic tests, radiography, magnetic particle inspection, and a liquid penetrant test.

Certain specific applications necessitate distinct examinations. For instance, chemical processing and sour applications require resistance to Intergranular Corrosion (IGC) or Hydrogen-induced Cracking (HIC).

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Specifications of stainless steel pipe fittings

Stainless steel pipe fittings specifications

Seamless Fittings Size Standard Welded Fittings Size
1/2″ to 10″ ASME/ANSI B16.9, ASME B16.28 1/2″ – 48″
Manufacturing process End Connections SS Fittings Applications
Forge, Cast, Press, Push socket weld / threaded Chemical, Oil and Gas Processing Industries
Schedule SS Fittings Thickness Fittings Type
Sch 5 to XXS 10 swg. to 20 swg. Elbow, tee, reducer, cap stub end
Fittings Specification Process Testing methods
ASTM A403 /ASME SA 403 Seamless, welded, fabricated proof test, hydrotest, NDT test, destructive

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Stainless steel fittings types

SS reducer

SS reducer

  • Standard: ASME B16.9/ ASME B16.28
  • Grades: 304, 316, 317L, 904L

Stainless steel elbow

Stainless steel elbow

  • Sizes: 1/2″ to 48″
  • Methods: Seamless, welded, buttweld

Stainless steel welded fittings

Stainless steel welded fittings

  • Schedule: SCH 5 to SCH XXS
  • Types: Elbow, tee, reducer, cap, pipe cross

SS tee

SS tee

  • Thickness: 1.5MM to 20MM
  • Application: Chemical, petrochemical, oil and gas

Stainless steel buttweld fittings

Stainless steel buttweld fittings

  • Surface finish: Hot dip galvanized, Epoxy coated, Mirror polish

Stainless steel seamless fittings

Stainless steel seamless fittings

  • Testing methods: hydrotest, proof test, NDT test, destructive

SS fittings manufacturer provide UT, PMI, IGC, tensile test

We can complete your SS pipe cap needs to finish your project with custom testing report
SS pipe fittings chemical composition
Grade Mn C P Si S Cr Ni Mo N
304 2.0 0.08 0.045 0.75 0.030 18.0-20.0 8.0-10.5 0.10
304L 2.0 0.030 0.045 0.75 0.030 18.0-20.0 8.0-12.0 0.10
304H 2.0 0.04-0.10 0.045 0.75 0.030 18.0-20.0 8.0-10.5
310 2 0.015 0.020 0.15 0.015 24.00 – 26.00 19.00 – 21.00 0.10 54.7 min
310S 2 0.08 0.045 1.0 0.030 24.00 – 26.00 19.00 – 21.00 0.75 53.095 min
316 2.0 0.08 0.045 1.0 0.030 16.00 – 18.00 11.00 – 14.00 2.00 – 3.00 67.845 min
316L 2.0 0.035 0.045 1.0 0.030 16.00 – 18.00 10.00 – 14.00 2.00 – 3.00 68.89 min
316H 0.10 0.10 0.045 0.75 0.030 16.00 – 18.00 10.00 – 14.00 2.00 – 3.00
SS 317 2.0 0.08 0.045 1.0 0.030 18.00 – 20.00 11.00 – 15.00 3.00 – 4.00 57.845 min
SS 317L 2.0 0.035 0.045 1.0 0.030 18.00 – 20.00 11.00 – 15.00 3.00 – 4.00 57.89 min
SS 321 2.0 0.08 0.045 1.0 0.030 17.00 – 19.00 5(C+N) – 0.70 9.00 – 12.00
SS 321H 2.0 0.04 – 0.10 0.045 1.0 0.030 17.00 – 19.00 9.00 – 12.00 0.10
SS 347 2.0 0.08 0.045 1.0 0.030 17.00 – 20.00 9.00 – 13.00
SS 347H 2.0 0.04 – 0.10 0.045 1.0 0.030 17.00 – 19.00 9.0 -13.0
SS 409 1.00 0.08 0.045 1.00 0.030 10.5 – 11.75 0.5
SS 410S 1.00 0.080 0.040 1.00 0.030 10.5 – 12.5
SS 904L 2.00 0.020 0.040 1.00 0.030 19.00 – 23.00 23.00 – 28.00 4.00 – 5.00

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SS buttweld fittings mechanical properties
Grade Melting Point Density Tensile Strength Elongation Yield Strength (0.2%Offset)
304/304H/304L 1400 °C (2550 °F) 8.0 gram/cm3 Psi 75000 , MPa 515 35 % Psi 30000 , MPa 205
310/310S 1402 °C (2555 °F) 7.9 gram/cm3 Psi 75000 , MPa 515 40 % Psi 30000 , MPa 205
316/316L/316H 1400 °C (2550 °F) 8.0 gram/cm3 Psi 75000 , MPa 515 35 % Psi 30000 , MPa 205
317/ 317L 1400 °C (2550 °F) 7.9 gram/cm3 Psi 75000 , MPa 515 35 % Psi 30000 , MPa 205
321/ 321H 1457 °C (2650 °F) 8.0 gram/cm3 Psi 75000 , MPa 515 40 % Psi 30000 , MPa 205
347/ 347H 1454 °C (2650 °F) 8.0 gram/cm3 Psi 75000 , MPa 515 35 % Psi 30000 , MPa 205
410S 1532°C (2790°F) 7.80 gram/cm3 Psi 75000 , MPa 515 25 % Psi 30000 , MPa 205
904L 1350 °C (2460 °F) 7.95 gram/cm3 Psi 71000 , MPa 490 35 % Psi 32000 , MPa 220

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Equivalent grades of stainless steel elbow
STANDARD UNS WERKSTOFF NR. JIS GOST BS EN AFNOR
SS 304 S30400 1.4301 SUS 304 08Х18Н10 304S31 X5CrNi1810 Z7CN18‐09
SS 304L S30403 1.4306 / 1.4307 SUS 304L 03Х18Н11 3304S11 X2CrNi189 / X2CrNi1911 Z3CN18‐10
SS 304H S30409 1.4301
SS 310 S31000 1.4841 SUS 310 20Ch25N20S2 310S24 X15CrNi2520
SS 310S S31008 1.4845 SUS 310S 20Ch23N18 310S16 X8CrNi2521
SS 316 S31600 1.4401 / 1.4436 SUS 316 316S31 / 316S33 X5CrNiMo17122 /
X3CrNiMo17133
Z7CND17‐11‐02
SS 316L S31603 1.4404 / 1.4435 SUS 316L 03Ch17N14M3 / 03Ch17N14M2 316S11 / 316S13 X2CrNiMo17122 /
X2CrNiMo18143
Z3CND17‐11‐02 / Z3CND18‐14‐03
SS 316H S31609 316S51
SS 317 S31700 1.4449 SUS 317 X5CrNiMo1713
SS 317L S31703 1.4438 SUS 317L X2CrNiMo18154
SS 321 S32100 1.4541 SUS 321 X6CrNiTi1810
SS 321H S32109 1.4878 SUS 321H X12CrNiTi189
SS 347 S34700 1.4550 SUS 347 X6CrNiNb1810
SS 347H S34709 1.4961 SUS 347H X6CrNiNb1812
SS 409 S40900 1.4512 SUS409 X2CrTi12
SS 410S S41008 1.4516 SUS410S X6CrNiTi12
SS 904L N08904 1.4539 SUS 904L STS 317J5L 904S13 X1NiCrMoCu25205 Z2 NCDU 2520

stainless steel fittings manufacturers stocks in seamless and welded manufacturing process

Tolerance of SS seamless fittings
Pipe fittings Tolerance
Common Type Of Buttweld fittings 45 degree elbows And 90 deg elbows fittings 180 Deg Returns
Normal Size Of Steel Pipe ID
at End
OD
at Bevel
WT For (Wall Thickness)
t / t1
Center-End Dai. A-B-C-M Back-Face Dai.
(K)
Center-Center Dai.
(O)
Align-ment of Ends
(U)
3 a 3 1/2 1,6 1 less 2 7 7 1
1/2 a 2 1/2 0,8 1 Not 2 7 7 1
32 a 48 4,8 +7 -5 5
4 1,6 +2 -1 than 2 7 7 1
8 1,6 2 of nominal 2 7 7 1
5 a 6 1,6 +3 -1 87,50% 2 7 7 1
10 3,2 +4 -3 tickness 2 7 7 2
20 a 24 4,8 +6 -5 3 10 2 7
12 a 18 3,2 +4 -3 3 10 2 7
26 a 30 4,8 +7 -5 3
WP grades classes of SS stub end
Construction fittings Classes Non-destructive Exam
Welded WX Radiography
Welded W Radiography or Ultrasonic
Seamless S None
Welded WU Ultrasonic
Stainless steel welded fittings pressure rating
fittings (psig) Pressure-Temperature ratings
Ratings of Temperature fittings Pressure Class
150 300
1 1/4 – 2 inch. 1/4 – 1 inch. 2 1/2 – 3 inch.
(oC) (oF)
93 200 265 1350 1785 910
-29 to 66 -20 to 150 300 1500 2000 1000
149 300 185 1050 1360 735
121 250 225 1200 1575 825
204 400 750 935 560
177 350 150 900 1150 650
260 500 450 510 385
232 450 600 725 475
288 550 300 300 300
SS tee manufacturing standards
  • MSS SP-43
  • ASME B16.9
  • ASME SA403/ASTM A403
Size chart of SS fittings
Welded fittings Seamless fittings
Elbows Up to 42″ Up to 24″
End Caps Up to 24″
Tees Upto 36″ Upto 24″
Return Bends Up to 8″
Reducers Up to 48″ Up to 24″
Swage Nipple Up to 4″
Cross Upto 36″ Upto 8″
Stainless steel reducer dimensions
Nominal
Pipe Size
Outside
Diameter
Reducers
Reduced from
(Inch)
(mm) (Inch) Reduced to
(Inch)
Concentric & Eccentric Length
(Inch)
1/2 21.3 0.840 1/4 1 1/2
3/8 1 1/2
3/4 26.7 1.050 3/8 2
1/2 2
1 33.4 1.315 3/8 2
1/2 2
3/4 2
1 1/4 42.2 1.660 1/2 2
3/4 2
1 2
1 1/2 48.3 1.900 1/2 2 1/2
3/4 2 1/2
1 2 1/2
1 1/4 2 1/2
2 60.3 2.375 3/4 3
1 3
1 1/4 3
1 1/2 3
2 1/2 73.0 2.875 1 3 1/2
1 1/4 3 1/2
1 1/2 3 1/2
2 3 1/2
3 88.9 3.500 1 3 1/2
1 1/2 3 1/2
2 3 1/2
2 1/2 3 1/2
3 1/2 101.6 4.000 1 1/4 4
1 1/2 4
2 4
2 1/2 4
3 4
4 114.3 4.500 1 1/2 4
2 4
2 1/2 4
3 4
3 1/2 4
5 141.3 5.563 2 5
2 1/2 5
3 5
3 1/2 5
4 5
6 168.3 6.625 2 1/2 5 1/2
3 5 1/2
3 1/2 5 1/2
4 5 1/2
5 5 1/2
8 219.1 8.625 3 6
3 1/2 6
4 6
5 6
6 6
10 273.1 10.750 4 7
5 7
6 7
8 7
12 323.9 12.750 5 8
6 8
8 8
10 8
SS pipe fittings weight chart
DN SCH 40S SCH 10S SCH 80S
90° Elbow 45° Elbow Equal tee 90° Elbow 45° Elbow Equal tee 90° Elbow 45° Elbow Equal tee
8 0.03 0.02 0.06 0.02 0.01 0.03 0.04 0.03 0.07
10 0.03 0.02 0.03 0.03 0.02 0.05 0.06 0.04 0.09
15 0.08 0.04 0.10 0.06 0.03 0.09 0.10 0.05 0.14
20 0.08 0.04 0.17 0.07 0.03 0.13 0.11 0.05 0.20
25 0.15 0.11 0.29 0.14 0.08 0.28 0.22 0.14 0.38
32 0.26 0.17 0.59 0.23 0.11 0.49 0.40 0.23 0.68
40 0.40 0.23 0.86 0.30 0.17 0.68 0.51 0.29 1.02
50 0.70 0.4 1.28 0.50 0.25 0.85 0.91 0.59 1.59
65 1.40 0.77 2.19 0.85 0.48 1.41 1.81 0.99 3.13
80 2.20 1.08 3.31 1.25 0.63 1.77 2.97 1.50 4.45
90 2.83 1.42 4.08 1.70 0.75 2.67 4.00 2.00 5.44
100 4.47 2.09 5.27 2.10 1.08 3.46 6.18 2.81 7.71
150 10.89 5.44 10.99 5.45 2.72 8.07 16.32 8.16 13.61
200 21.54 10.77 20.91 10.20 5.33 15.65 33.11 16.56 28.12
250 38.56 19.27 35.38 18.15 9.75 26.46 51.71 25.86 49.90
300 59.42 29.71 62.14 25.80 13.62 39.46 79.38 39.69 83.91
Dimensions of SS fittings

Dimensions of SS fittings

Nominal
Pipe
Size
(inch)
Outside
Diameter
45° Elbows 90° Elbow 180° Returns
Long Radius Long Radius Short Radius Long Radius
(milimeter) (inch) Center to Face
(inch)
Radius
(inch)
Center to Face
(inch)
Center to Face
(inch)
Center to Center
(inch)
Back to face
(inch)
1/2 21.3 0.840 5/8 1 1/2 2 1 7/8
3/4 26.7 1.050 7/16 1 1/8 2 1/4 1 11/16
1 33.4 1.315 7/8 1 1/2 1 3 2 3/16
1 1/4 42.2 1.660 1 1 7/8 1 1/4 3 3/4 2 3/4
1 1/2 48.3 1.900 1 1/8 3 2 1/4 1 1/2 4 1/2 3 1/4
2 60.3 2.375 1 3/8 4 3 2 6 4 3/16
2 1/2 73.0 2.875 1 3/4 5 3 3/4 2 1/2 7 1/2 5 3/16
3 88.9 3.500 2 6 4 1/2 3 9 6 1/4
3 1/2 101.6 4.000 2 1/4 7 5 1/4 3 1/2 10 1/2 7 1/4
4 114.3 4.500 2 1/2 8 6 4 12 8 1/4
5 141.3 5.563 3 1/8 10 7 1/2 5 15 10 5/16
6 168.3 6.625 3 3/4 12 9 6 18 12 5/16
8 219.1 8.625 5 12 12 8 24 16 5/16
10 273.1 10.750 6 1/4 15 15 10 30 20 3/8
12 323.9 12.750 7 1/2 18 18 12 36 24 3/8

 

Nominal
Pipe
Sizes
(inch)
Outside
Dia
Straight Crosses Caps Straight Tees Stub Ends
(milimeter) (inch) Center to End
(inch)
Length
(inch)
Center to End
(inch)
Lap Diameter
(inch)
Long Length
(inch)
Short Length
(inch)
1/2 21.3 0.840 1 1 1 3/8 3 2
3/4 26.7 1.050 1 1 1/8 1 11/16 3 2
1 33.4 1.315 1 1/2 1 1/2 1 1/2 2 4 2
1 1/4 42.2 1.660 1 7/8 1 1/2 1 7/8 2 1/2 4 2
1 1/2 48.3 1.900 2 1/4 1 1/2 2 1/4 2 7/8 4 2
2 60.3 2.375 2 1/2 1 1/2 2 1/2 3 5/8 6 2 1/2
2 1/2 73.0 2.875 3 1 1/2 3 4 1/8 6 2 1/2
3 88.9 3.500 3 3/8 2 3 3/8 5 6 2 1/2
3 1/2 101.6 4.000 3 3/4 2 1/2 3 3/4 5 1/2 6 3
4 114.3 4.500 4 1/8 2 1/2 4 1/8 6 3/16 6 3
5 141.3 5.563 4 7/8 3 4 7/8 7 5/16 8 3
6 168.3 6.625 5 5/8 3 1/2 5 5/8 8 1/2 8 3 1/2
8 219.1 8.625 7 4 7 10 5/8 8 4
10 273.1 10.750 8 1/2 5 8 1/2 12 3/4 10 5
12 323.9 12.750 10 6 10 15 10 6
What is the purpose of the pressure class in stainless steel elbow?

The pressure class – 150, 3000, etc. – indicates the pressure the fittings can handle (in PSI). A stainless steel elbow must withstand the amount stated in the corresponding piping code.

The schedule number, or SCH, linked to the thickness of the pipe, is salient here. Note that if the pipe sections have different dimensions, both ends have to comply.

Stainless steel seamless fittings are suited to high-pressure conditions, primarily as they don’t contain a welded seam (a potentially weak region). They can also be used with corrosive fluids.

7 steps to finding the perfect stainless steel tube fittings?

The widespread acceptance of these fittings emanates from their many merits: long service life, corrosion resistance, and low maintenance requirements.

  • Analyse application requirements, i.e., altering the direction, branching the piping, or lowering the diameter
  • Select the kind of fittings: For instance, threaded SS fittings are straightforward to install with limited expert help or tools. They are appropriate for non-critical applications.
  • Assess the dimensions, pressure class, and atmospheric/ambient conditions.
  • Find a manufacturer that uses quality raw materials for stainless steel tube fittings.
  • Check the quality norms and adherence to global standards.
  • Lay out delivery timelines, with packaging and shipping guidelines.
  • Verify intensive testing, like a PMI and other NDT procedures, and supporting documents, like an MTC.
Are SS buttweld fittings suitable for high-pressure uses?

These fittings are considered the strongest and most suitable for tolerating high pressures. Stainless steel buttweld fittings deliver a robust connection due to complete-penetration welding. They use hot or cold forming followed by heat treatment to attain desired mechanical properties.

SS buttweld fittings benefit from a smooth inner surface, which maintains the flow of the corresponding media. Also, it reduces turbulence and circumvents sudden pressure fluctuations.

Can stainless steel pipe fittings manufacturers give discounts on purchase?

Trusted manufacturers with sizable portfolios and established clientele can usually provide discounts on stainless pipe fittings. Pick a provider with a keen quality focus, efficient production techniques, and scalable shipping.

Customers can also request discounts on delivery and installation charges of SS pipe fittings. Expedited timelines and customized requirements usually cost more.