Stainless Steel 304 Flanges

Stainless Steel 304 Flange Supplier & Manufacturer in India

Stainless Steel 304 Flanges – ASTM A182 F304 WNRF and SORF Flanges manufactured by Solitaire Overseas, Mumbai

Stainless Steel 304 Flanges also known as the 18-8 grade are the most widely used austenitic stainless steel pipe flanges in the world, valued for their balanced combination of corrosion resistance, strength, and weldability. Produced by ASTM A182 F304 / ASME SA182 F304 (and the low-carbon variant F304L), these flanges carry a nominal composition of 18% chromium and 8–10.5% nickel, with a maximum carbon content of 0.08%. The chromium forms a self-healing passive oxide layer that resists oxidising acids, atmospheric corrosion, and most organic compounds across a wide temperature range.

We have been manufacturing SS 304 Flanges UNS S30400, DIN 1.4301, Werkstoff Nr. 1.4301 at our Mumbai facility for years, and the production sequence has not changed: open-die or closed-die forging, solution annealing, and precision CNC machining to final dimensional tolerances. Every flange leaves our plant with a mill test report traceable to the raw material heat number. We stock the full range from ½" (15 NB) to 48" (1200 NB) across pressure classes 150# to 2500#, covering all face types — WNRF, SORF, Blind, Orifice, Socket Weld, and more for both domestic orders and export shipments.

Why Source SS 304 Flanges from Solitaire Overseas?

ISO-certified manufacturing facility in Mumbai with full in-house machining
Mill Test Reports (MTR) supplied with every order — heat traceable, NABL accredited lab tested
Third-party inspection accepted: SGS, Bureau Veritas, TÜV, Lloyds, DNV
Government-recognised export house with active supply to 50+ countries
Short lead times — ex-stock availability in common sizes and classes
Dual-certified material — 304/304L stocking for flexibility without re-ordering

Ready to discuss your requirements or need a quote? Contact Solitaire Overseas today for premium Stainless Steel Flanges.

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SS 304 Flange Types
Stainless Steel 304 Flanges Specifications
304 Stainless Steel Flanges Chemical Composition
Mechanical Properties of SS 304 Flanges
Physical Properties of SS 304 Flanges
ASTM A182 F304 Equivalent Grades
SS 304 WNRF Flange Dimensions (ASME B16.5)
A182 F304 SORF Flange Dimensions (ASME B16.5)
Weight Chart of SS 304 Flanges
Schedule Class of SS 304 / 304L Flanges
Stainless Steel 304 Flanges Pressure Rating
Applications of SS 304 Flanges
SS 304 Flange Price List
Frequently Asked Questions

SS 304 Flange Types

Solitaire Overseas stocks and manufactures ASTM A182 F304 / SA182 F304 Stainless Steel Flanges in all standard types conforming to ASME B16.5, B16.47 Series A & B, and DIN standards. Each type below is available in Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) facing.

SS 304 Weld Neck Flange (WNRF)

Tapered hub transfers stress to pipe wall — ideal for high-pressure and cyclic service. Available in ASME B16.5 Class 150 to 2500.

A182 F304 SORF Slip-On Flange

Slides over pipe and is fillet-welded inside and outside. Lower cost, easier alignment — widely used in Class 150 and 300 services.

ASME SA182 F304 Blind Flange (BLRF)

Solid disc used to seal and terminate a pipeline. Available dual-rated 150/300# and in large diameters per ASME B16.47.

SS 304 Orifice Flange

Fitted with pressure taps for flow measurement. Supplied in matched pairs with jack screws, in Class 300 and above.

A182 F304 Socket Weld Flange (SWRF)

Pipe inserted into socket recess and fillet-welded from outside. Ideal for small-bore, high-pressure pipework up to 3 inch.

SS 304 Lap Joint Flange

Used with a stub end to allow rotation for bolt-hole alignment. Cost-effective for alloy piping — flange can be carbon steel.

SS 304 Threaded (Screwed) Flange

NPT/BSPT threaded bore — no welding required. Used in low-pressure, non-cyclic services and where welding is not permissible.

Stainless Steel 304 Flanges Specifications

All SS 304 / SA182 F304 Flanges are manufactured and tested to the following standards. Custom specifications, special end preparations, and third-party inspection are available on request.

Parameter	Details
Material Specification	ASTM A182 / ASME SA182 – Grade F304 / F304L
Plate Specification	ASTM A240 / ASME SA240 – Grade 304 / 304L
Standards	ANSI, ASME, DIN, EN, BS, JIS, AWWA, MSS-SP44
Dimensional Standards	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS10, EN-1092, DIN, AS2129, AS4087
Size Range	½" (15 NB) to 48" (1200 NB)
Pressure / Class	PN6, PN10, PN16, PN25, PN40, PN64 · Class 150#, 300#, 600#, 900#, 1500#, 2500#
Flange Face Types	Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Large Male-Female (LMF), Small Male-Female (SMF), Lap Joint Face (LJF)
Production Process	Forged, Solution Annealed, Heat Treated & Precision Machined
Marking	Heat No., Material Grade, Size, Schedule, Pressure Class, Manufacturer's Mark
Surface Finish Options	Natural (Pickled & Passivated), Oil Black Paint, Anti-Rust Paint, Zinc Plated, Hot-Dip Galvanized
Test & Inspection	Chemical Analysis, Mechanical Testing, Dimensional Inspection, Hydrostatic Test (if required), PMI
Documentation	Mill Test Report (EN 10204 3.1 / 3.2), Pressure Test Certificate, Third-Party Inspection Reports

304 Stainless Steel Flanges Chemical Composition

The corrosion resistance and weldability of ASTM A182 F304 Stainless Steel Flanges derive from a tightly controlled chemical composition verified by heat analysis on every production batch.

Grade	C (max)	Mn (max)	Si (max)	P (max)	S (max)	Cr	Ni	N (max)	Mo
SS 304 (UNS S30400)	0.08	2.0	0.75	0.045	0.030	18.0–20.0	8.0–10.5	0.10	–
SS 304L (UNS S30403)	0.03	2.0	0.75	0.045	0.030	18.0–20.0	8.0–12.0	0.10	–

Mechanical Properties of SS 304 Flanges

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% (MPa) min	Elongation (% in 50mm) min	Hardness Rockwell B max	Hardness Brinell (HB) max
SS 304 / A182 F304	515 (Psi: 75,000)	205 (Psi: 30,000)	40	92 HRB	201 HB
SS 304L / A182 F304L	485 (Psi: 70,000)	170 (Psi: 25,000)	40	92 HRB	201 HB

Melting Point: 1400°C – 1455°C (2550°F – 2650°F) | Density: 8.0 g/cm³

Physical Properties of SS 304 Flanges

Grade	Density (kg/m³)	Elastic Modulus (GPa)	Mean CTE 0–100°C (µm/m/°C)	Mean CTE 0–315°C	Mean CTE 0–538°C	Thermal Cond. at 100°C (W/m·K)	Thermal Cond. at 500°C	Specific Heat 0–100°C (J/kg·K)	Electrical Resistivity (nΩ·m)
A182 F304 / F304L	8000	193	17.2	17.8	18.4	16.2	21.5	500	720

ASTM A182 F304 Stainless Steel Flanges Equivalent Grades

Our ASTM A182 F304 / SA182 F304 Flanges conform to the following international grade equivalents, enabling cross-referencing for global procurement specifications.

Standard	UNS	Werkstoff Nr. (DIN)	EN	JIS	BS	AFNOR	GOST
SS 304	S30400	1.4301	X5CrNi18-10	SUS 304	304S31	Z7CN18-09	08Х18Н10
SS 304L	S30403	1.4307	X2CrNi18-9	SUS 304L	304S11	Z3CN18-10	03Х18Н11

SS 304 WNRF Flange Dimensions of ASME B16.5 Class 150 (in mm & inches)

Dimensions of Stainless Steel 304 Weld Neck Raised Face (WNRF) Flanges per ANSI/ASME B16.5 Class 150. All dimensions in millimetres unless stated.

NPS (inch)	NB (mm)	O.D. Flange (mm)	Flange Thickness Q (mm)	Raised Face Dia. R (mm)	Hub O.D. at Base X (mm)	Length Thru Hub Y (mm)	Bore W (mm)	Bolt Circle BC (mm)	No. of Bolts	Bolt Hole Dia. (mm)
1/2	15	88.9	11.2	34.9	30.2	47.6	22.4	60.5	4	15.9
3/4	20	98.4	12.7	42.9	38.1	52.3	27.8	69.9	4	15.9
1	25	107.9	14.2	50.8	49.3	55.6	34.5	79.4	4	15.9
1-1/4	32	117.5	15.7	63.5	58.7	57.2	43.2	88.9	4	15.9
1-1/2	40	127.0	17.5	73.0	65.1	61.9	49.5	98.6	4	15.9
2	50	152.4	19.1	91.9	77.8	63.5	62.0	120.7	4	19.1
2-1/2	65	177.8	22.4	104.8	90.5	69.9	74.7	139.7	4	19.1
3	80	190.5	23.9	127.0	108.0	69.9	90.7	152.4	4	19.1
4	100	228.6	23.9	157.2	134.9	76.2	116.1	190.5	8	19.1
6	150	279.4	25.4	215.9	193.7	88.9	170.7	241.3	8	22.4
8	200	342.9	28.4	269.9	247.7	101.6	221.5	298.5	8	22.4
10	250	406.4	30.2	323.9	304.8	101.6	276.4	362.0	12	25.4
12	300	482.6	31.8	381.0	365.1	114.3	327.0	431.8	12	25.4
14	350	533.4	35.1	412.8	400.1	127.0	359.2	476.3	12	28.6
16	400	596.9	36.6	469.9	457.2	139.7	411.2	539.8	16	28.6
18	450	635.0	39.6	533.4	508.0	152.4	461.8	577.9	16	31.8
20	500	698.5	42.9	584.2	558.8	152.4	514.4	635.0	20	31.8
24	600	812.8	47.8	692.2	663.4	165.1	616.0	749.3	20	35.1

A182 F304 SORF Flange Dimensions — ASME B16.5 Class 150 (in mm)

Dimensional data for ASTM A182 F304 Slip-On Raised Face (SORF) Flanges per ASME B16.5 Class 150, covering NPS ¼ inch to 24 inch. All measurements in millimetres.

NPS (inch)	O.D. Flange (mm)	No. of Bolts	Bolt Dia. (inch)	Bolt Hole Dia. (mm)	Bolt Circle Dia. (mm)
1/4	85.7	4	1/2	15.7	57.2
1/2	88.9	4	1/2	15.7	60.3
3/4	98.4	4	1/2	15.7	69.9
1	107.9	4	1/2	15.7	79.4
1-1/4	117.5	4	1/2	15.7	88.9
1-1/2	127.0	4	1/2	15.7	98.6
2	152.4	4	5/8	19.1	120.7
2-1/2	177.8	4	5/8	19.1	139.7
3	190.5	4	5/8	19.1	152.4
3-1/2	215.9	8	5/8	19.1	177.8
4	228.6	8	5/8	19.1	190.5
5	254.0	8	3/4	22.4	215.9
6	279.4	8	3/4	22.4	241.3
8	342.9	8	3/4	22.4	298.5
10	406.4	12	7/8	25.4	362.0
12	482.6	12	7/8	25.4	431.8
14	533.4	12	1	28.6	476.3
16	596.9	16	1	28.6	539.8
18	635.0	16	1-1/8	31.8	577.9
20	698.5	20	1-1/8	31.8	635.0
24	812.8	20	1-1/4	35.1	749.3

Weight Chart of Stainless Steel 304 Flanges in KG & LB

Use the following weight data for shipping, structural load calculations, and material procurement planning. Weights are for Class 150 Raised Face flanges per ASME B16.5.

Size (inch)	DN (NB)	O.D. (mm)	Thk. Min (mm)	Hub Dia. X (mm)	Raised Face Dia. G (mm)	Hub Length Y (mm)	Bolt Circle BC (mm)	Bolt Holes (mm)	No. Bolts	Bolt Dia.	Weight (kg)	Weight (lb)
1/2"	15	89.00	11.20	30.20	35.10	15.70	60.50	15.80	4	1/2"	0.4	0.9
3/4"	20	98.50	12.70	38.10	42.90	15.70	69.90	15.80	4	1/2"	0.7	1.5
1"	25	108.00	14.20	49.30	50.80	17.50	79.30	15.80	4	1/2"	0.8	1.8
1-1/4"	32	117.50	15.70	58.70	63.50	20.60	88.90	15.80	4	1/2"	1.2	2.6
1-1/2"	40	127.00	17.50	65.00	73.20	22.40	98.60	15.80	4	1/2"	1.5	3.3
2"	50	152.50	19.10	77.70	91.90	25.40	120.70	19.10	4	5/8"	2.3	5.1
2-1/2"	65	178.00	22.40	90.40	104.60	28.40	139.70	19.10	4	5/8"	3.7	8.1
3"	80	190.50	23.90	108.00	127.00	30.20	152.40	19.10	4	5/8"	4.1	9.0
3-1/2"	90	216.00	23.90	122.20	139.70	31.80	177.80	19.10	8	5/8"	5.1	11.2
4"	100	228.50	23.90	134.90	157.20	33.30	190.50	19.10	8	5/8"	5.9	13.0
5"	125	254.00	23.90	163.60	185.70	36.60	215.90	22.40	8	3/4"	7.0	15.4
6"	150	279.50	25.40	192.00	215.90	39.60	241.30	22.40	8	3/4"	8.4	18.5
8"	200	343.00	28.40	246.10	269.70	44.50	298.50	22.40	8	3/4"	13.0	28.6
10"	250	406.50	30.20	304.80	323.90	49.30	362.00	25.40	12	7/8"	18.0	39.5
12"	300	482.50	31.80	365.30	381.00	55.60	431.80	25.40	12	7/8"	29.0	64.0
14"	350	533.50	35.10	400.10	412.80	57.20	476.30	28.50	12	1"	39.0	86.0
16"	400	597.00	36.60	457.20	469.90	63.50	539.80	28.50	16	1"	47.0	103.0
18"	450	635.00	39.60	505.00	533.40	68.30	577.90	31.80	16	1-1/8"	57.0	126.0
20"	500	698.50	42.90	558.80	584.20	73.20	635.00	31.80	20	1-1/8"	76.0	167.0
24"	600	813.00	47.80	663.40	692.20	82.60	749.30	35.10	20	1-1/4"	97.0	214.0

Schedule Class of SS 304 / 304L Flanges

ASME Standard	Pipe Size	Connection Type	Material	Max. Pressure (psi)
ASME B16.5 Class 150	1/2"	FNPT Threaded	SS 304 / 304L	150
ASME B16.5 Class 150	1/2"	Socket Weld	SS 304 / 304L	275
ASME B16.5 Class 150	1/2"	Butt Weld (WNRF)	SS 304 / 304L	275
ASME B16.5 Class 150	3/4"–4"	Socket Weld	SS 304 / 304L	275
ASME B16.5 Class 150	2", 4"	FNPT Threaded	SS 304 / 304L	150
ASME B16.5 Class 300	1/2"–4"	Slip On (SORF)	SS 304 / 304L	720
ASME B16.5 Class 300	1-1/4"	FNPT Threaded	SS 304 / 304L	720
ASME B16.5 Class 600	1/2"–24"	Weld Neck (WNRF)	SS 304 / 304L	1440
ASME B16.5 Class 900	1/2"–24"	Weld Neck (WNRF)	SS 304 / 304L	2160
ASME B16.5 Class 1500	1/2"–24"	Weld Neck (WNRF)	SS 304 / 304L	3600
ASME B16.5 Class 2500	1/2"–12"	Weld Neck (WNRF)	SS 304 / 304L	6000

Stainless Steel 304 Flanges Pressure Rating — ANSI/ASME B16.34

Pressure ratings (in psi) for SS 304 / SA182 F304 Flanges across temperature and pressure class, per ANSI/ASME B16.34. Select the correct class for your operating temperature.

Temperature (°F)	Class 150#	Class 300#	Class 400#	Class 600#	Class 900#	Class 1500#	Class 2500#
-20 to 100	275	720	960	1440	2160	3600	6000
200	230	600	800	1200	1800	3000	5000
300	205	540	720	1080	1620	2700	4500
400	190	495	660	995	1490	2485	4140
500	170	465	620	930	1395	2330	3880
600	140	435	580	875	1310	2185	3640
700	110	425	565	850	1275	2125	3540
800	80	405	540	805	1210	2015	3360
900	50	390	520	780	1165	1945	3240
1000	20	320	430	640	965	1605	2675
1100	20	255	345	515	770	1285	2145
1200	20	155	205	310	465	770	1285
1300	20	85	115	170	255	430	715
1400	20	50	65	95	145	240	400
1500	10	25	35	55	80	135	230

Applications of Stainless Steel 304 Flanges

ASTM A182 F304 Stainless Steel Flanges are specified across a broad range of industries owing to their non-sensitising weld behaviour, hygiene compliance, and ability to handle mildly corrosive media at elevated temperatures. Below are the principal end-use sectors served by Solitaire Overseas.

Oil & Gas: Onshore pipeline manifolds, wellhead tie-in flanges, separator skids
Chemical Processing: Acid piping, solvent transfer lines, reactor outlet connections
Petrochemical & Refining: Hydrocarbon fractionation columns, heat exchanger flanges, overhead lines
Power Generation: Steam and feedwater piping, turbine bypass lines, condenser water flanges
Food & Beverage / Dairy: Sanitary piping, CIP/SIP connections, brewery and dairy processing lines
Pharmaceutical: WFI water systems, clean steam lines, API manufacturing piping
Water Treatment: Desalination pre-treatment, municipal water distribution manifolds
Fertiliser & Agrochemical: Urea and ammonia plant piping, granulation equipment
Automotive & Industrial: Exhaust manifold flanges, heat exchanger headers, hydraulic system connections
Architecture & Construction: Structural connections, ornamental piping systems, rooftop HVAC

Stainless Steel 304 Flange Price List

Indicative pricing for SORF (Slip-On Raised Face) A182 Stainless Steel F304 Flanges, ASME B16.5 Class 150#. Prices are shown FOB and CIF Mumbai in INR, USD, SGD, and EUR. For Blind, WNRF, Orifice, or custom class pricing, please contact us for a tailored quotation.

Sr. No.	Description	Size	Approx. Wt. (kg)	FOB (INR)	CIF (INR)	FOB (USD)	CIF (USD)	FOB (SGD)	CIF (SGD)	FOB (EUR)	CIF (EUR)
1	SORF A182 SS F304 B16.5 150#	15mm (½")	0.49	349.60	380.00	5.30	5.76	3.57	3.88	6.36	6.91
2	SORF A182 SS F304 B16.5 150#	20mm (¾")	0.61	434.70	472.50	6.59	7.16	4.44	4.82	7.90	8.59
3	SORF A182 SS F304 B16.5 150#	25mm (1")	0.90	699.20	760.00	10.59	11.52	7.14	7.76	12.71	13.82
4	SORF A182 SS F304 B16.5 150#	32mm (1¼")	1.13	737.15	801.25	11.17	12.14	7.52	8.18	13.40	14.57
5	SORF A182 SS F304 B16.5 150#	40mm (1½")	1.48	854.45	928.75	12.95	14.07	8.72	9.48	15.54	16.89
6	SORF A182 SS F304 B16.5 150#	50mm (2")	2.37	1164.95	1266.25	17.65	19.19	11.89	12.92	21.18	23.02
7	SORF A182 SS F304 B16.5 150#	65mm (2½")	3.60	2096.45	2278.75	31.76	34.53	21.39	23.25	38.12	41.43
8	SORF A182 SS F304 B16.5 150#	80mm (3")	4.10	2794.50	3037.50	42.34	46.02	28.52	31.00	50.81	55.23
9	SORF A182 SS F304 B16.5 150#	100mm (4")	6.04	3105.00	3375.00	47.05	51.14	31.68	34.44	56.46	61.36
10	SORF A182 SS F304 B16.5 150#	125mm (5")	6.53	3493.70	3797.50	52.94	57.54	35.65	38.75	63.52	69.05
11	SORF A182 SS F304 B16.5 150#	150mm (6")	7.78	4968.00	5400.00	75.27	81.82	50.69	55.10	90.33	98.18
12	SORF A182 SS F304 B16.5 150#	200mm (8")	12.98	9004.50	9787.50	136.43	148.30	91.88	99.87	163.72	177.96
13	SORF A182 SS F304 B16.5 150#	250mm (10")	17.96	11643.75	12656.25	176.42	191.76	118.81	129.15	211.71	230.11

Prices are indicative and subject to change based on raw material costs and order quantity. Contact us for current pricing on WNRF, Blind, Orifice, Socket Weld, and higher-class flanges.

Frequently Asked Questions — Stainless Steel 304 Flanges

What is the difference between SS 304 and SS 304L flanges?

SS 304L is the low-carbon variant of SS 304, with a maximum carbon content of 0.03% versus 0.08% in standard 304. The reduced carbon limits carbide precipitation in the heat-affected zone during welding, preventing sensitisation and intergranular corrosion. For most general-purpose applications the two grades perform identically; however, 304L is the preferred choice for welded assemblies operating in corrosive environments, particularly where post-weld annealing is not feasible. Solitaire Overseas supplies dual-certified 304/304L material on request, offering procurement flexibility without re-stocking.

What is ASTM A182 F304?

ASTM A182 F304 is the standard specification covering forged or rolled alloy and stainless steel pipe flanges, fittings, and valves for high-temperature service. The "F304" designation identifies the Grade 304 austenitic stainless steel composition — 18–20% Cr, 8–10.5% Ni, max 0.08% C. The equivalent ASME designation is SA182 F304. Flanges produced to this standard are suitable for high-temperature piping systems and must pass chemical analysis, mechanical testing, and dimensional inspection before release.

What is the maximum operating temperature for SS 304 flanges?

SS 304 flanges can be used in continuous service up to approximately 870°C (1600°F) in non-oxidising, non-sensitising conditions. For intermittent service the upper limit is around 925°C (1700°F). Caution is required in the sensitisation range of 425°C–860°C — prolonged exposure at these temperatures causes chromium carbide precipitation at grain boundaries, reducing corrosion resistance. For service in this range, specify SS 304L (low-carbon) flanges to minimise this risk. Pressure ratings decrease significantly above 400°F; consult the ANSI/ASME B16.34 pressure-temperature chart on this page.

Can SS 304 flanges be used in seawater or marine environments?

SS 304 flanges are not recommended for continuous immersion in seawater or high-chloride environments. Chloride ions above approximately 200 ppm break down the passive oxide layer, making Grade 304 susceptible to pitting and crevice corrosion. For coastal, offshore, or marine process applications, Grade 316 or 316L flanges (containing 2–3% molybdenum) provide significantly better resistance. For aggressive seawater or brine service, Duplex or Super Duplex grades are recommended.

What sizes are available in SS 304 flanges?

Solitaire Overseas manufactures and supplies Stainless Steel 304 Flanges in nominal pipe sizes from ½ inch (15 NB) through 48 inch (1200 NB), conforming to ANSI/ASME B16.5 (up to 24 inch) and ASME B16.47 Series A & B (26 inch to 60 inch). All standard pressure classes — 150#, 300#, 600#, 900#, 1500#, and 2500# — are available. Common sizes in Class 150 and 300 are held in ex-stock at our Mumbai warehouse for fast dispatch.

What is the pressure rating of SS 304 Class 150 flanges at room temperature?

At temperatures between -20°F and 100°F (-29°C to 38°C), ASME B16.5 Class 150 SS 304 flanges are rated at 275 psi (18.96 bar). Ratings reduce progressively with temperature — to 205 psi at 300°F, 140 psi at 600°F, and just 10 psi at 1500°F. For higher pressure ratings, Class 300 (720 psi), Class 600 (1440 psi), Class 900 (2160 psi), Class 1500 (3600 psi), and Class 2500 (6000 psi) flanges are available from Solitaire Overseas.

Is 304 stainless steel rust proof?

No — SS 304 is corrosion resistant, not fully rust-proof. The 18% chromium forms a self-repairing passive oxide film that protects against rust in most atmospheric conditions and mildly corrosive media. However, in the presence of chlorides (salt air, seawater, de-icing salts) or strongly reducing acids (hydrochloric acid, dilute sulphuric acid), this protective film can break down, leading to pitting, crevice corrosion, or stress corrosion cracking. Regular cleaning and avoiding standing water in crevices extends service life in marginal environments.

What certifications and documents are supplied with SS 304 flanges from Solitaire Overseas?

Every order of Stainless Steel 304 Flanges from Solitaire Overseas is supplied with: Mill Test Report (MTR) per EN 10204 Type 3.1 (or 3.2 with third-party endorsement), confirming heat-traceable chemical composition and mechanical test results; Dimensional Inspection Report; Hydrostatic Test Certificate (where specified); Positive Material Identification (PMI) report; and Packing List / Country of Origin certificate for export orders. Third-party inspection by SGS, Bureau Veritas, TÜV, Lloyds, or DNV can be arranged at the client's request.