Stainless Steel Seamless Pipes Manufacturer & Supplier

Q: What is the difference between seamless pipe vs welded pipe?

Seamless pipes are made from a single solid billet — no joints, no heat-affected zone, higher pressure ratings, and full compliance with ASME B31.3 high-pressure requirements. Welded pipes are formed from rolled sheet with a longitudinal weld; they are more cost-effective for low-pressure utility service but cannot match the structural integrity of SMLS pipe under cyclic or extreme-temperature loading.

Q: Do you supply seamless SS pipe for pharma and food-grade applications?

Yes. We supply seamless stainless pipe pharma food grade in TP316L with electropolished internal surfaces (Ra ≤ 0.4 µm or 0.8 µm) per DIN 11850 / ISO 2037. These pipes meet FDA, EHEDG, and 3-A Sanitary Standards for CIP/SIP and sterile process lines. Full MTC 3.1 certification is provided.

What Are Stainless Steel Seamless Pipes?

Stainless steel seamless pipes also called SMLS pipes are hollow, joint-free cylinders produced by hot-rolling or cold-drawing a solid SS seamless pipe billet. Because there is no weld seam, every seamless stainless steel pipe delivers uniform wall thickness, superior burst-pressure resistance, and outstanding resistance to corrosion and high temperatures. Manufactured to ASTM A312 / ASME SA312, they are the preferred choice for fluid transportation, heat exchangers, boilers, and pressure vessels across demanding industries worldwide.

Unlike welded pipes, SMLS pipes carry no heat-affected zone (HAZ) along the pipe wall, making them ideal wherever fatigue, cyclic loading, or aggressive media would compromise a weld seam. Available in schedules from SCH 5S to SCH 160 and XXS, and in grades from TP304 to TP347, our seamless SS pipes cover virtually every industrial specification.

Stainless Steel Seamless Pipe Manufacturer & Exporter in India

Solitaire Overseas is a stainless steel seamless pipe manufacturer in India with a reputation for precision-engineered piping solutions delivered to critical industrial projects on every continent. As a trusted SS seamless pipe supplier in Mumbai, we stock finished pipe ready for immediate dispatch, backed by a global logistics network that makes us a competitive stainless steel seamless pipe exporter in India.

Our pipes are produced from solid stainless steel billets with no welded joints ensuring high strength, uniform structural properties, and maximum resistance to pressure, temperature, and corrosion. We serve the oil & gas, petrochemical, power generation, pharma, food-grade, and heavy-engineering sectors, where operational reliability is non-negotiable.

ASTM A312 / ASME SA312EN 10216 / ANSI B36.19Mill Test Certificate 3.1 / 3.2ISO-Certified QMSHydrostatic & NDT Tested

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Stainless Steel Seamless Pipe Grades
Stainless Steel Seamless Pipes Specifications
Stainless Steel Seamless Pipes Standards
Chemical Composition of SS Seamless Pipes
Mechanical Properties of Seamless SS Pipes
Stainless Steel Seamless Pipes Sizes
ASTM A312 SS Seamless Pipe Schedule Chart
Stainless Steel Seamless Pipe Weight Chart (Per Meter)
Applications of Stainless Steel Seamless Pipes
Why Choose Solitaire Overseas?
Related Products
FAQ’s About Seamless Stainless Steel Pipe

Stainless Steel Seamless Pipe Grades

We supply SS seamless pipes in a wide range of austenitic stainless steel grades, each selected for specific operating conditions:

SS 304 Seamless Pipes (ASTM A312 TP304): General-purpose grade with good corrosion resistance and excellent formability; widely used in food processing and industrial piping.
SS 304L Seamless Pipes (ASTM A312 TP304L): Low-carbon variant offering improved weldability and resistance to intergranular corrosion.
SS 316 Seamless Pipes (ASTM A312 TP316): Contains molybdenum for enhanced resistance to chlorides and aggressive chemicals; ideal for marine and chemical environments.
SS 316L Seamless Pipes (ASTM A312 TP316L): Low-carbon version of 316, suitable for high-temperature and corrosive applications requiring post-weld integrity.
SS 321 Seamless Pipes (ASTM A312 TP321): Titanium-stabilised grade designed for high-temperature service and resistance to carbide precipitation.
SS 347 Seamless Pipes (ASTM A312 TP347): Columbium/niobium-stabilised; preferred for high-temperature petrochemical service and nuclear applications.
SS 310/310S Seamless Pipes: High chromium and nickel content provides excellent oxidation resistance at elevated temperatures.

ASTM A312 Stainless Steel Seamless Pipe Specifications

Our ASTM A312 SMLS pipes and ASME SA312 seamless pipes are available in the following configurations:

Specification	Details
Standards	ASTM A312, ASME SA312, ASTM A213, EN 10216-5, ANSI B36.19
Material	Stainless Steel (Austenitic, Duplex, Super Duplex)
Sizes	1/8″ NB to 24″ NB (Nominal Bore)
Outer Diameter	6.35 mm to 609.6 mm
Wall Thickness / Schedule	SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 120, SCH 160, XXS
Type	Round, Square, Rectangular, Hydraulic
End Finish	Plain End, Bevelled End, Threaded
Length	Single Random, Double Random, Cut Length
Test Certificates	Mill Test Certificate EN 10204 3.1 / 3.2

Stainless Steel Seamless Pipes Standards

Our stainless steel seamless pipes are manufactured and tested in accordance with major international standards:

Standard	Description
ASTM A312 / ASME SA312	Seamless, welded, and heavily cold-worked austenitic stainless steel pipes — the primary standard for ASTM A312 SMLS pipe
ASTM A213	Seamless ferritic and austenitic alloy-steel tubes for boilers and heat exchangers
ASTM A269	Seamless and welded stainless steel tubing for general service
EN 10216-5	European standard — seamless pipe EN 10216 stainless for pressure purposes
ANSI B36.19	Stainless steel pipe dimensions and schedules (SCH 5S to XXS)
ASTM A106	Seamless carbon steel pipe for high-temperature service (compatible applications)

Chemical Composition of SS Seamless Pipes

This data highlights the precise elemental makeup of various stainless steel grades, detailing the concentration of Chromium, Nickel, and Molybdenum that defines their corrosion resistance.

Grade	UNS No.	C (max)	Mn (max)	Cr	Ni	Mo
TP304	S30400	0.08	2.0	18.0–20.0	8.0–11.0	—
TP304L	S30403	0.035	2.0	18.0–20.0	8.0–13.0	—
TP316	S31600	0.08	2.0	16.0–18.0	10.0–14.0	2.0–3.0
TP316L	S31603	0.035	2.0	16.0–18.0	10.0–14.0	2.0–3.0
TP321	S32100	0.08	2.0	17.0–19.0	9.0–12.0	—
TP347	S34700	0.08	2.0	17.0–20.0	9.0–13.0	—

Mechanical Properties of Seamless SS Pipes

The table below outlines the essential physical performance metrics, including tensile and yield strength, ensuring the material meets the structural demands of high-pressure environments.

Grade	Tensile Strength (MPa, min)	Yield Strength (MPa, min)	Elongation (%, min)	Hardness (HRB, max)
TP304	515	205	40	92
TP304L	485	170	40	92
TP316	515	205	40	95
TP316L	485	170	40	95
TP321	515	205	40	95
TP347	515	205	40	95

SS Seamless Pipe Dimensions & Sizes

Solitaire Overseas offers stainless steel seamless pipes including large diameter stainless steel seamless pipes and thick wall stainless steel seamless pipes — across a comprehensive range of sizes and schedules:

Parameter	Range / Details
Outside Diameter (OD)	6 mm NB to 600 mm NB
Schedules	SCH 5S, SCH 10S, SCH 40, SCH 80, SCH 120, SCH 160, XXS
Wall Thickness	As per ASTM A312 / ANSI B36.19 and customer requirements
Large Diameter Range	10″ to 24″ NB (SCH 10S to SCH 80S available)
Thick Wall / High-Pressure	SCH 160 & XXS; custom heavy-wall on request
Length	Random, double random, or cut lengths

Custom sizes, tight tolerances, and special finishes can be supplied on request.

ASTM A312 SS Seamless Pipe Schedule Chart

Use the schedule chart below to select the correct wall thickness and seamless pipe pressure rating for your system:

Nominal Pipe Size (NPS)	Commonly Available Schedules
1/8″ to 3/4″	SCH 10S, SCH 40S, SCH 80S
1″ to 2″	SCH 5S, SCH 10S, SCH 40S, SCH 80S
2 1/2″ to 3″	SCH 5S, SCH 10S, SCH 40S, SCH 80S
4″	SCH 5S, SCH 10S, SCH 40 stainless steel seamless pipe, SCH 80S
6″	SCH 5S, SCH 10S, SCH 40S, SCH 80S
8″	SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 120, SCH 160 stainless steel seamless pipe
10″ to 12″	SCH 5S, SCH 10S, SCH 40S, SCH 80S
14″ to 24″	SCH 10S, SCH 40S (STD), SCH 80S (XS)

Stainless Steel Seamless Pipe Weight Chart (Per Meter)

Use our seamless pipe weight per meter reference table for project planning and cost estimation:

NPS (inch)	OD (mm)	Wall Thickness (mm)	Schedule	Weight (kg/m)
1/2″	21.3	2.77	40S	1.29
1/2″	21.3	3.73	80S	1.65
3/4″	26.7	2.87	40S	1.71
3/4″	26.7	3.91	80S	2.23
1″	33.4	3.38	40S	2.54
1″	33.4	4.55	80S	3.29
1 1/2″	48.3	3.68	40S	4.11
1 1/2″	48.3	5.08	80S	5.49
2″	60.3	3.91	40S	5.52
2″	60.3	5.54	80S	7.60
3″	88.9	5.49	40S	11.47
3″	88.9	7.62	80S	15.51
4″	114.3	6.02	40S	16.32
4″	114.3	8.56	80S	22.67
6″	168.3	7.11	40S	28.69
6″	168.3	10.97	80S	43.21
8″	219.1	8.18	40S	43.20
8″	219.1	12.70	80S	65.63

Stainless Steel Seamless Pipe Price in India

Stainless steel seamless pipe price in India varies depending on grade (SS 304, 316L, 321, 347), schedule (SCH 40 to SCH 160), diameter (NB 1/2″ to 24″), and order quantity. As a manufacturer and direct exporter, Solitaire Overseas offers competitive ex-works and CIF pricing with no intermediary margins.

Key price factors:

Grade: TP304/304L prices are lowest; TP316L, TP321, and TP347 carry a premium.
Schedule / Wall Thickness: Heavier schedules (SCH 80, SCH 160, XXS) consume more material.
Diameter: Large diameter seamless pipes above 8″ NB are priced by weight (kg).
Quantity: Bulk mill orders attract significantly better rates than spot purchases.
Certifications: MTC 3.2 / third-party inspection add a modest premium.

Contact our sales team for a mill-direct price list, updated monthly based on LME nickel and stainless coil indices.

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Seamless Pipe vs Welded Pipe — Which Should You Choose?

Understanding the difference between seamless pipe vs welded pipe helps engineers select the right product for their pressure class and application:

Seamless SS Pipe (SMLS)

No weld seam — uniform strength throughout
Higher pressure and temperature ratings
Superior fatigue and cyclic-load resistance
Required for oil & gas, boiler, and nuclear codes
Preferred where Mill Test Certificate and full traceability are mandatory

Welded SS Pipe (ERW / TIG)

Lower cost for large diameters and standard services
Weld seam may be a stress concentration point
Suitable for low-pressure structural and non-critical service
Faster availability in non-standard sizes
Not accepted under many high-pressure piping codes

Rule of thumb: Specify ASTM A312 SMLS pipe (seamless) for pressures above 150 bar, temperatures above 300 °C, or wherever code compliance (ASME B31.3, B31.1) demands it. Use welded for low-pressure utility service.

Applications of Stainless Steel Seamless Pipes

Oil & Gas Industry: Used in upstream, midstream, and downstream operations for transporting hydrocarbons, high-pressure fluids, and gases under extreme conditions. SCH 80 and SCH 160 grades are standard for downhole and Christmas-tree assemblies.
Petrochemical & Chemical Processing: Ideal for handling corrosive chemicals, acids, and solvents in reactors, heat exchangers, and processing pipelines. TP316L and TP317L grades dominate chloride-rich environments.
Power Generation: Used in boilers, superheaters, economisers, and steam pipelines where high temperature and pressure resistance is required. ASTM A213 TP321 and TP347 are specified for creep-sensitive zones.
Pharmaceutical & Food Grade — seamless stainless pipe pharma food grade: TP316L with electropolished or Ra ≤ 0.4 µm interior finishes meets FDA, EHEDG, and GMP hygiene requirements for CIP/SIP systems and sterile product transfer lines.
Industrial & Mechanical Applications: Applied in hydraulic systems, pressure vessels, and high-stress mechanical components where thick-wall seamless pipe ensures safety margins.

Why Choose Solitaire Overseas?

Premium raw materials with strict manufacturing controls ensure batch-to-batch consistency.
Complete coverage of grades, sizes, and schedules — SS 304 to SS 347, SCH 5S to SCH 160 / XXS.
Global supply to Middle East, Europe, Asia, Africa, and the Americas from our Mumbai warehouse.
Bulk sourcing and mill-direct procurement allow competitive SS seamless pipe pricing.
Fast technical support and customised solutions for EPC contractors and end users.
Every pipe supplied with Mill Test Certificate (EN 10204 3.1 / 3.2) for full traceability.

SS Seamless Pipes Export & Quality Certifications

All stainless steel seamless pipes supplied by Solitaire Overseas undergo rigorous inspection and testing, including:

Chemical composition analysis (PMI / spectrometer)
Mechanical testing (tensile, yield, elongation)
Hydrostatic and non-destructive testing (UT / ET)
Dimensional and visual inspection per ASTM / EN

MTC EN 10204 3.1MTC EN 10204 3.2 (TPI)ASTM A312 CompliantASME SA312 CompliantEN 10216-5ISO-Certified QMS

Get a Quote for Stainless Steel Seamless Pipes

Fill out the form below or email sales@solitaire-overseas.com for a fast, no-obligation quote on any stainless steel seamless pipe requirement — any grade, any schedule, any quantity.

FAQ — Seamless Stainless Steel Pipe

What is a seamless stainless steel pipe?

A seamless stainless steel pipe (SMLS pipe) is manufactured from a solid round billet without any welded joints. The extrusion and drawing process ensures high strength, dimensional uniformity, and superior pressure resistance, making it the preferred choice for critical industrial applications including oil & gas, power, and chemical processing.

What is the difference between seamless pipe vs welded pipe?

Seamless pipes are made from a single solid billet with no joints, no heat-affected zone, higher pressure ratings, and full compliance with ASME B31.3 high-pressure requirements. Welded pipes are formed from rolled sheet with a longitudinal weld; they are more cost-effective for low-pressure utility service but cannot match the structural integrity of SMLS pipe under cyclic or extreme-temperature loading.

What is the seamless pipe pressure rating?

The seamless pipe pressure rating depends on grade, OD, and wall thickness schedule. For example, a 2" NB ASTM A312 TP316L pipe in SCH 80S has a working pressure of approximately 177 bar at ambient temperature, while SCH 160 and XXS schedules achieve significantly higher ratings.

What does ASTM A312 SMLS pipe mean?

ASTM A312 is the ASTM International standard covering seamless (SMLS), welded, and heavily cold-worked austenitic stainless steel pipes. The SMLS designation confirms the pipe was produced without a weld seam. The companion ASME standard is SA312, used in pressure vessel and boiler code compliance.

What grades are available for ASTM A312 TP316L seamless pipe?

ASTM A312 TP316L seamless pipe is the most-requested grade for corrosive service. It contains 2–3% molybdenum for chloride resistance and a maximum 0.035% carbon to prevent sensitisation. We also stock ASTM A312 TP304, TP321, and TP347 seamless pipes for high-temperature and stabilised-grade applications.

Do you supply seamless SS pipe for pharma and food-grade applications?

Yes. We supply seamless stainless steel pipe for pharma and food-grade applications in TP316L with electropolished internal surfaces (Ra ≤ 0.4 µm or 0.8 µm) per DIN 11850 / ISO 2037. These pipes meet FDA, EHEDG, and 3-A Sanitary Standards for CIP/SIP and sterile process lines.

What is the lifespan of a seamless pipe?

High-quality SMLS pipes can last 20–50 years or more, depending on material grade, operating conditions, and maintenance. Correct grade selection — for example TP316L in chloride environments or TP321 in high-temperature service — is the primary factor in achieving maximum service life.

Do you provide Mill Test Certificates with seamless pipe orders?

Yes. Every order is supplied with a Mill Test Certificate (MTC) as per EN 10204 3.1 as standard. Third-party 3.2 inspection by TÜV NORD, Bureau Veritas, SGS, or Lloyd’s Register is available on request.