Girgaon, Mumbai, Maharashtra 400004, India [email protected] +91 9869506920

Stainless Steel Pipe Fittings Manufacturer in India

ASME B16.9 & MSS SP-43 Buttweld Elbows, Tees, Reducers, End Caps & Stub Ends in ASTM A403 WP304/304L & WP316/316L

Engineering Excellence & Material Quality

Global Exporter of ASTM A403 Stainless Steel Buttweld Pipe Fittings

Rajtilak Metal is an established manufacturer and global exporter of high-integrity austenitic stainless steel pipe fittings based in Mumbai, India. Operating in full compliance with ISO 9001 quality systems and accredited by leading international audit authorities, we supply seamless and welded buttweld components engineered for severe-service environments across oil, gas, chemical processing, pharmaceutical, marine, and power generation industries.

Global Supply Conformance: All stainless steel fittings are manufactured strictly adhering to ASME B16.9, ASME B16.28, and MSS SP-43 standards, complete with original EN 10204 Type 3.1 Mill Test Certification (MTC), NDT validation, and dual-stamped heat-number traceability.

Core Stainless Steel Fitting Configurations

ASTM A403 45 Degree Stainless Steel Elbow

45 Degree SS Elbow

ASTM A403 90 Degree Stainless Steel Elbow

90 Degree SS Elbow

ASME B16.9 Stainless Steel Equal Tee

Equal & Reducing Tee

ASTM A403 Concentric and Eccentric Reducer

Concentric Reducer

SA403 Eccentric Pipe Reducer

Eccentric Reducer

ASTM A403 Stainless Steel Pipe End Cap

Pipe End Cap

MSS SP-43 Type A and B Stub End

Lap Joint Stub End

ASME B16.9 Stainless Steel Cross

Pipe Cross Fitting

Understanding ASTM A403 Standard Specification

ASTM A403 covers wrought austenitic stainless steel fittings intended for pressure piping systems. Divided into structural classes including WP-S (seamless), WP-W (welded with radiography), and WP-WX (welded with 100% radiographic examination of all seams), this standard mandates rigorous heat treatment through solution annealing followed by rapid quenching to optimize intergranular corrosion resistance.

Suitability for Natural Gas, LNG, and Offshore Service

Austenitic stainless steel buttweld fittings—especially low-carbon grades WP304L and WP316L, and molybdenum-enhanced grades—are widely approved for sour gas treatment, cryogenic LNG transmission, and marine fuel lines. They withstand embrittlement down to cryogenic temperatures and resist hydrogen sulfide (H2S) stress corrosion cracking in conformance with NACE MR0175/ISO 15156.

Technical Specification Overview

Specification ScopeWrought Austenitic Stainless Steel Buttweld & Socket Fittings
Dimensional StandardsASME B16.9, ASME B16.11, ASME B16.28, MSS SP-43, EN 10253-4, DIN 2605, JIS B2312
Nominal Size RangeNPS 1/2″ through NPS 48″ (DN 15 to DN 1200)
Wall Thickness / SchedulesSCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, SCH XXS (ASME B36.19M / B36.10M)
Standard Material GradesASTM / ASME SA403 WP304, WP304L, WP304H, WP316, WP316L, WP316Ti, WP317L, WP321, WP347, WP904L
Testing & InspectionPMI, Hydrostatic, Radiographic (RT), Ultrasonic (UT), Liquid Penetrant (PT), Intergranular Corrosion (IGC) Test to ASTM A262 Practice E
CertificationEN 10204 3.1 Mill Test Certificate, NACE MR0175 / ISO 15156 compliant, 3rd-party inspection accepted (TUV, DNV, BV, SGS, Lloyd's)
Harmonized System (HS) Code7307.23.00 (Buttweld Stainless Steel Fittings), 7307.22.00 (Threaded), 7307.29.00 (Other)

Schedule 40 Stainless Steel Fittings Dimensions & Maximum Working Pressure

NPS (Inches)Outside Diameter (OD in)Average ID (in)Nominal Wall (in)Weight (kg/m approx.)Max Working Pressure (PSI at Ambient)
1/2″0.8400.6020.1090.170590
3/4″1.0500.8040.1130.226480
1″1.3151.0290.1330.333450
1-1/2″1.9001.5900.1450.537330
2″2.3752.0470.1540.720280
3″3.5003.0420.2161.488260
4″4.5003.9980.2372.118220
6″6.6256.0310.2803.733180
8″8.6257.9420.3225.619160
10″10.7509.9760.3657.966140
12″12.75011.8890.40610.534130

Schedule 80 Stainless Steel Fittings Dimensions & Pressure Rating

NPS (Inches)Outside Diameter (OD in)Average ID (in)Nominal Wall (in)Weight (kg/m approx.)Max Working Pressure (PSI at Ambient)
1/2″0.8400.5260.1470.213850
3/4″1.0500.7220.1540.289690
1″1.3150.9360.1790.424630
1-1/2″1.9001.4760.2000.711470
2″2.3751.9130.2180.984400
3″3.5002.8640.3002.010370
4″4.5003.7860.3372.938320
6″6.6255.7090.4325.610280
8″8.6257.5650.5008.522250
10″10.7509.4930.59312.635230
12″12.75011.2940.68717.384230

ASTM A403 Mechanical Properties by Grade

GradeUNS NumberTensile Strength min. (ksi / MPa)Yield Strength min. (ksi / MPa)Elongation min. (% in 2″)Brinell Hardness (HBW max.)
WP304S3040075 / 51530 / 20540%183
WP304LS3040370 / 48525 / 17040%183
WP316S3160075 / 51530 / 20535%217
WP316LS3160370 / 48525 / 17035%217
WP321S3210075 / 51530 / 20535%217
WP347S3470075 / 51530 / 20535%217
WP904LN0890471 / 49031 / 21535%217

Chemical Composition Limits (%) for Common Grades

GradeCarbon (C) maxManganese (Mn) maxSilicon (Si) maxChromium (Cr)Nickel (Ni)Molybdenum (Mo)Nitrogen (N) max
WP3040.0802.001.0018.0 – 20.08.0 – 11.0—0.10
WP304L0.0302.001.0018.0 – 20.08.0 – 12.0—0.10
WP3160.0802.001.0016.0 – 18.010.0 – 14.02.00 – 3.000.10
WP316L0.0302.001.0016.0 – 18.010.0 – 14.02.00 – 3.000.10
WP3210.0802.001.0017.0 – 19.09.0 – 12.0—Ti 5x(C+N) min
WP3470.0802.001.0017.0 – 19.09.0 – 13.0—Nb 10xC min

ASME B16.9 Dimensional Tolerances

Nominal Pipe Size (NPS)OD at Bevel (mm)Center-to-End Tolerances: 90°/45° Elbows & Tees (mm)Overall Length: Reducers & Stub Ends (mm)Wall Thickness
1/2″ to 2-1/2″+1.6 / -0.8± 1.6± 1.6Minimum wall thickness shall not be less than 87.5% of nominal pipe schedule wall thickness
3″ to 3-1/2″± 1.6± 1.6± 1.6
4″ to 8″± 1.6± 1.6± 1.6
10″ to 18″+4.0 / -3.2± 2.4± 2.4

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