Vivid Steel & Engineering Co. Ltd

Note: The exact product specification should be confirmed against the customer’s application, dimensions, pressure/temperature requirements, code requirements, and purchase order.

Seamless vs Welded Stainless Steel 316L Pipe

Feature	SS 316L Seamless Pipe	SS 316L Welded Pipe
Construction	Manufactured without a longitudinal weld	Manufactured with a welded longitudinal seam
Typical use	Pressure and demanding process applications	General/process piping and larger sizes
Surface	May be supplied with different finishes	Weld area can be treated/finished as required
Dimensional availability	Broad range	Very broad range, particularly larger sizes
Fabrication	Good	Excellent when properly welded
Inspection	Depends on specification/order	Weld and NDT requirements can be specified
Cost	Generally higher	Often more economical
Selection	Based on pressure, code, size and service	Based on service, specification, weld requirements and economics

Stainless Steel 316L Chemical Composition

Element	316L Typical / Specification Limit, %
Carbon (C)	≤ 0.030
Manganese (Mn)	≤ 2.00
Silicon (Si)	≤ 0.75
Phosphorus (P)	≤ 0.045
Sulfur (S)	≤ 0.030
Chromium (Cr)	16.0–18.0
Nickel (Ni)	10.0–14.0
Molybdenum (Mo)	2.0–3.0
Nitrogen (N)	≤ 0.10
Iron (Fe)	Balance

The low-carbon chemistry is a key characteristic of 316L, while chromium, nickel, and molybdenum provide the alloy’s corrosion-resistance profile. Published compositions can differ slightly according to the product standard and grade variant.

Stainless Steel 316L Mechanical Properties

Typical minimum mechanical requirements for 316L pipe under commonly referenced ASTM A312 requirements are shown below. Actual requirements vary with the applicable standard and product form.

Mechanical Property	Typical Requirement
Tensile Strength, min.	485 MPa
Yield Strength / 0.2% Proof, min.	170 MPa
Elongation, min.	35%
Hardness	As specified by applicable standard
Material Structure	Austenitic
Work Hardening	Significant

Austenitic stainless steels are generally characterized by high ductility and toughness and can exhibit substantial work hardening.

Important: Mechanical values are specification-dependent. The applicable material standard and MTC should be used for contractual or engineering acceptance.

Stainless Steel 316L Physical Properties

Typical room-temperature physical properties are shown for engineering reference. Values can vary somewhat with product condition, temperature, and source.

Physical Property	Typical Value
Density	~8.0 g/cm³
Density	~8,000 kg/m³
Elastic Modulus	~193 GPa
Thermal Conductivity	~16 W/m·K
Specific Heat	~500 J/kg·K
Electrical Resistivity	~0.74 µΩ·m
Coefficient of Thermal Expansion	~15–17 × 10⁻⁶/K
Magnetic Character	Generally non-magnetic in annealed condition; may become slightly magnetic after cold working
Melting Range	Approximately 1370–1400°C

Physical properties should be treated as engineering reference data rather than guaranteed material-certification values.

Stainless Steel 316L Pipe Weight Chart

The following is an approximate reference weight chart for selected nominal sizes and representative Schedule 10S-type wall thicknesses. Actual nominal weights should be verified against the applicable dimensional standard and order specification.

Weight values are approximate and intended for estimation only. For procurement, shipping, structural calculations, and commercial quantities, use the applicable standard’s nominal mass/weight table and the supplier’s certified dimensions.

ASME B36.19 includes a table for dimensions and nominal weights/masses of welded and seamless stainless steel pipe.

Stainless Steel 316L Pipe Standards & Specifications

The applicable standard should always be confirmed before purchase. Vivid Steel & Engineering Co. Ltd. can quote according to your required material, manufacturing, dimensional and inspection specification.

ASTM A312 / ASME SA312

ASTM A312/A312M is commonly referenced for seamless, welded, and heavily cold-worked austenitic stainless steel pipe intended for high-temperature and general corrosive service.

For ASME BPVC applications, the corresponding ASME material specification may be SA-312/SA-312M, subject to the applicable code edition and project requirements.

ASTM A358

ASTM A358/A358M covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe for corrosive or high-temperature service and can be relevant for certain welded pipe constructions.

ASME B36.19M

ASME B36.19M covers dimensions of welded and seamless wrought stainless steel pipe for high- and low-temperature and pressure applications. It provides standardized dimensions, wall thicknesses, and nominal weights.

ASME B31.3

ASME B31.3 is widely used for process piping design and establishes requirements related to materials, design, fabrication, assembly, examination, inspection, and testing for applicable process piping systems.

ASME B16.5

ASME B16.5 covers pipe flanges and flanged fittings, including pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing.

EN 1.4404 / 316L

316L is commonly associated with EN 1.4404, although the precise chemistry and requirements should be checked against the relevant EN product standard. The grade is part of the Cr-Ni-Mo family of austenitic stainless steels.

Commonly Requested Standards

• ASTM A312 / ASME SA312
• ASTM A358
• ASME B36.19M
• ASME B31.3
• ASME B16.5
• EN 10216-5
• EN 10217-7
• EN 1.4404
• UNS S31603
• Applicable ISO, DIN, JIS or other project standards

Quality Tests & Assurance for SS 316L Pipes and Tubes