Stainless Steel 304 Seamless Pipes

304 Stainless Steel Seamless Pipe is a high-performance hollow cylinder produced from solid round billets without longitudinal welds. This 18% chromium–8% nickel austenitic alloy, manufactured to ASTM A312/ASME SA312 standards, offers exceptional corrosion resistance and superior dimensional accuracy for critical pressure and high-temperature service.

Chemical processing, petrochemicals, and power generation require the 515 MPa tensile strength these pipes provide. Handling temperatures up to 870°C, sizes span ½" NB to 24" NB and schedules SCH 5S to 160. These specifications ensure durable, high-pressure performance. This makes them a resilient choice for any industrial environment.

304 Stainless Steel Seamless Pipe Price

SS 304 seamless pipe prices in India range from ₹225 per kg for conventional sizes and schedules to ₹500 per kg for heavy-wall or large-bore diameters. The more complicated the billet-piercing and drawing procedure makes seamless pipes than welded ones.

Factors Affecting Price

The following main market factors have a direct effect on the current price list for 304 stainless steel seamless pipe.

Nickel Price on LME: Fluctuations in London Metal Exchange nickel prices represent the largest raw-material cost variable.
Wall Schedule: Heavier schedules like SCH 80S and 160 require significantly more material per meter.
Outer Diameter: Larger diameters necessitate bigger billet stock and additional processing passes, increasing total costs.
Surface Finish: Specialised treatments, such as brilliant annealing or electropolishing, cost significantly more to process than ordinary finishes.
Mill Certification: Inspections by a third party in accordance with EN 10204 3.1 or 3.2 incur additional costs for verified quality assurance.
Order Quantity: High-volume mill-run orders typically attract lower per-kilogram rates compared to small-lot purchases.

Types of 304 Stainless Steel Seamless Pipe

This inventory includes several manufacturing and finish variants designed to satisfy specific industrial and high-pressure piping needs and requirements.

Hot-finished Seamless Pipes
Cold-drawn Seamless Pipes
Bright Annealed Seamless Pipes
Pickled and Passivated Seamless Pipes
Polished Seamless Pipes (No. 4 / No. 6)

304 Stainless Steel Seamless Pipe Specifications

Key specification parameters for 304 stainless steel seamless pipe used in procurement and engineering design.

Parameter	Details
Standard	ASTM A312 / ASME SA312
Outer Diameter Range	½" NB to 24" NB (21.34 mm to 609.60 mm)
Wall Thickness Range	SCH 5S to SCH 160 / XXS
Length	SRL: 4–7 m; DRL: 7–14 m; cut-to-length available
End Finish	Plain End, Bevel End

Chemical Composition of 304 Stainless Steel Seamless Pipe

Grade 304 chemical limits per ASTM A312. These element ranges govern corrosion behaviour and mechanical performance.

Element	Max (%)
Carbon (C)	0.08
Manganese (Mn)	2.00
Phosphorus (P)	0.045
Sulfur (S)	0.030
Silicon (Si)	0.75
Chromium (Cr)	20.00
Nickel (Ni)	10.50
Nitrogen (N)	0.10
Iron (Fe)	—

The self-healing passive oxide layer of chromium (18.00–20.00%) makes this grade corrosion-resistant. Nickel (8.00–10.50%) stabilises austenitic structure and toughens at ambient and subzero temperatures. To prevent heat-affected zone sensitisation in subsequent field welds, carbon is limited to 0.08%.

Mechanical Properties of 304 Stainless Steel Seamless Pipe

Minimum mechanical properties for ASTM A312 TP304 seamless pipes in the annealed condition.

Property	Value
Tensile Strength (min)	515 MPa (75 ksi)
Yield Strength (min, 0.2% offset)	205 MPa (30 ksi)
Elongation in 2" (min)	35%
Hardness (Brinell, max)	201 HBW
Hardness (Rockwell B, max)	92 HRB

Physical Properties of 304 Stainless Steel Seamless Pipe

Physical properties of grade 304 in the annealed condition for engineering reference.

Property	Value
Density	7.93 g/cm³ (0.286 lb/in³)
Melting Range	1400–1450 °C (2552–2642 °F)
Modulus of Elasticity	193 GPa (28,000 ksi)
Thermal Conductivity (at 100 °C)	16.3 W/m·K
Thermal Expansion (20–100 °C)	17.2 × 10⁻⁶ /°C
Specific Heat Capacity	500 J/kg·K

304 Stainless Steel Seamless Pipe Size Chart

Standard NPS sizes for seamless grade 304 pipes with outer diameter and typical schedule range per ASME B36.19M.

NPS (inch)	OD (mm)	OD (inches)	Schedules Available
½	21.34	0.840	5S, 10S, 40S, 80S, 160
¾	26.67	1.050	5S, 10S, 40S, 80S, 160
1	33.40	1.315	5S, 10S, 40S, 80S, 160
1½	48.26	1.900	5S, 10S, 40S, 80S, 160
2	60.33	2.375	5S, 10S, 40S, 80S, 160
3	88.90	3.500	5S, 10S, 40S, 80S
4	114.30	4.500	5S, 10S, 40S, 80S
6	168.28	6.625	5S, 10S, 40S, 80S
8	219.08	8.625	5S, 10S, 40S, 80S
12	323.85	12.750	5S, 10S, 40S
16	406.40	16.000	5S, 10S
24	609.60	24.000	5S, 10S

Schedule Chart of 304 Stainless Steel Seamless Pipe

Outside Diameter	Sch. 5S		Sch. 10S		Sch. 20S		Sch. 40S		Sch. 80S		Sch. 160S
Inch	NB	OD (mm)	Wall Thick	Weight Kg/m	Wall Thick	Weight Kg/m	Wall Thick	Weight Kg/m	Wall Thick	Weight Kg/m	Wall Thick	Weight Kg/m	Wall Thick
1/8	6	10.3	0.4	0.124	0.73	0.228			1.24	0.472	1.73	0.647
1/4	8	13.7	0.54	0.217	0.73	0.228			1.65	0.742	2.24	0.982
3/8	10	17.2	0.64	0.312	0.89	0.43			2.31	1.072	3.2	1.437
1/2	15	21.3	0.84	0.513	1.09	0.8			2.77	1.27	3.73	1.62	4.78
3/4	20	26.7	1.09	0.8	1.65	1.27			2.87	1.68	3.91	2.2	5.56
1	25	33.4	1.65	1.27	2.11	1.62			3.38	2.5	4.55	3.19	6.35
1 1/4	32	42.2	1.65	1.63	2.77	2.77			3.56	3.38	4.85	4.56	6.35
1 1/2	40	48.3	1.65	1.9	2.77	3.11			3.68	4.05	5.08	5.44	7.14
2	50	60.3	1.65	2.74	2.77	3.92			3.91	5.54	5.54	7.48	8.74
2 1/2	65	73	2.11	3.56	3.05	5.26			5.16	8.17	7.01	11.59	9.53

Key Features of 304 Stainless Steel Seamless Pipe

Discover the benefits that make these seamless pipes an ideal choice for high-pressure industrial use:

No Longitudinal Weld Seam
Superior Dimensional Accuracy
Uniform Wall Thickness
Wide Schedule Range
Corrosion Resistance
Good Weldability
Non-Magnetic Properties

Applications of 304 Stainless Steel Seamless Pipe

These high-integrity pipes are used in several industries for essential fluid transmission, high-pressure systems, and sterile processing environments:

High-Pressure Process Lines
Oil and Gas Utility Piping
Pharmaceutical Manufacturing
Power Generation
Heat Exchangers
Food and Beverage
Cryogenic Service
Water Treatment

How to Choose the Right 304 Stainless Steel Seamless Pipe Supplier?

Selecting the right supplier ensures quality and durability. Follow these key steps to find your ideal partner.

Selecting the Right Supplier

Request the heat number and mill test certificate before ordering. Suppliers should use Centravis, Nippon Steel, or Aperam seamless 304. Generic warehouse certificates are unacceptable for pressure-rated service. Verified documentation and well-recognised sources ensure the necessary safety and quality for the projects.

Technical Considerations

For seamless pipes in critical service, confirm that the wall thickness at any point meets the specified minimum after applying the standard under-tolerance. It provides both industrial safety and structural integrity to the project. When manufacturing tolerances increase, consider a higher Nominal Pipe Size (NPS). Evaluating Supplier Credibility

Evaluating Supplier Credibility

Find vendors with ISO 9001, ISO 14001, and ISO 45001 quality, environmental, and safety certifications. Successful Bureau Veritas, SGS, or TÜV audits build trust. All these certificates ensure suppliers follow the strictest and safest industrial practices.

Procurement Strategy

Please specify ASTM A312, grade TP304, and seamless process when ordering. Include pipe size, schedule, length, termination type, and finish. Please seek the relevant quality certificate type (MTC) to check all standards. Consider allowing a lead time of a few weeks for non-stocked sizes and heavy-wall schedules when it comes to project procurement.