Stainless Steel Seamless Pipes

Stainless Steel Seamless Pipe Specifications

The table given below consists of the stainless steel seamless pipe specifications, like standards, grades, size ranges, schedules, and material categories.

Size and Weight Chart

The following chart shows outside diameter, wall thickness, and weight per metre for commonly ordered SS seamless pipe sizes across 3 schedules.

Dimensional Tolerances

ASTM A312 specifies the following dimensional tolerances for stainless steel seamless pipes. These values apply to hot-finished and cold-drawn products. Cold-drawn seamless pipes generally achieve tighter tolerances than hot-finished products.

Stainless Steel Seamless Pipe Price

Stainless steel seamless pipe pricing depends on grade, size (OD and wall thickness), schedule, order quantity, and prevailing raw material costs. SS 304 seamless pipe is generally 15 to 20% less expensive than SS 316 because it contains no molybdenum. Duplex 2205 carries a further premium due to its specialised alloy content.

Factors that influence the final price per metre include:

• Grade selection (304 vs 316 vs 904L vs duplex 2205)
• Wall thickness and schedule (heavier schedules cost more per unit length)
• Order quantity (bulk orders attract volume discounts)
• Surface finish (mill finish, pickled, or electropolished)
• Testing requirements (hydrostatic test, PMI, ultrasonic examination)
• Delivery terms (FOB, CIF, CFR)

For current pricing on any grade or size, request a quote from our sales team. We provide transparent pricing with no hidden charges.

Stainless Steel Seamless Pipe Applicable Standards & Grades

Applicable Standards

Stainless steel seamless pipes conform to multiple national and international standards depending on the end-use application and export destination. The table below lists the primary standards that comply with our pipes.

Grades

The most commonly specified grades are TP304/304L for general service and TP316/316L for marine and chemical environments. High-temperature applications depend on TP321 and TP347. Severe-corrosion environments require 904L or duplex 2205. This section covers austenitic and duplex grade families in detail.

Austenitic Stainless Steel Seamless Pipe Grades

TP304

TP304 is the most widely preferred austenitic grade. It contains 18% chromium and 8% nickel (the classic 18/8 composition). This grade provides reliable general-purpose corrosion resistance for food processing, architectural trim, and chemical containment.

TP304L

TP304L has a reduced carbon content of 0.035% max, which prevents carbide precipitation during welding. Choose TP304L when the pipe will be welded and post-weld heat treatment isn't feasible.

TP316 / TP316L

TP316 contains 2 to 3% molybdenum, which gives it superior resistance to chloride pitting and crevice corrosion compared to TP304. Marine environments, coastal chemical plants, and pharmaceutical clean-rooms commonly rely on this grade. TP316 costs approximately 15 to 20% more than TP304 due to higher alloy content, but the cost is justified wherever chlorides are present. The low-carbon TP316L variant follows the same logic as TP304L for welded constructions.

TP321

TP321 is stabilised with titanium to resist intergranular corrosion at temperatures between 425 and 815 degrees Celsius. It's used in exhaust manifolds, expansion bellows, and refinery transfer lines.

TP347

TP347 uses niobium (columbium) stabilisation instead of titanium and offers better creep strength above 540 degrees Celsius. Petrochemical furnace tubing and reactor piping prefer TP347 for this reason.

Duplex Stainless Steel Seamless Pipe Grades

2205 (UNS S31803)

Grade 2205 contains 22% chromium, 5% nickel, and 3% molybdenum. Its yield strength of 65 ksi (450 MPa) allows engineers to specify thinner wall sections. This leads to a reduction in weight and material cost. Offshore oil and gas platforms, desalination plants, and chemical tankers frequently specify 2205 seamless pipe per ASTM A790.

Stainless Steel Seamless Pipe Industrial Applications

Stainless steel seamless pipes serve 6 major industry sectors where corrosion resistance, hygiene, and pressure integrity are important.

Seamless vs Welded Stainless Steel Pipes

Seamless stainless steel pipes have no longitudinal weld seam, which provides a uniform grain structure and consistent wall thickness around the full circumference. This makes them the preferred choice for high-pressure, high-temperature, and safety-critical piping systems.

Welded stainless steel pipes are a practical alternative for low-pressure structural and fluid-transfer applications where cost is more preferable than pressure integrity. For critical process piping, boiler tubing, and subsea lines, seamless pipe remains the industry standard.

Shipping and Packaging

Heavy-duty wooden boxes Packing

Export Packaging Standard

We strictly follow seaworthy export handling standards to protect stainless steel seamless pipe from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

• Heavy-duty wooden boxes with moisture barrier lining
• HDPE stretch film wrapping on all bundles
• Plastic end caps on threaded and plain-end pipes
• Silica gel desiccants to minimize moisture exposure
• ISPM-15 fumigated wooden packaging for export

Pipe Bundle Yard Staging

Container End-Cap Protection

Wrapped Export-Ready Bundles

Frequently Asked Questions