ASTM A213 TP316H stainless steel tube for Boiler

Why do some boiler systems still suffer from premature tube failure, leakage, or uneven heat transfer,even when high-grade stainless steel materials are used? The root cause often lies in the quality of heat treatment, grain structure, dimensional precision, and internal cleanliness of the tubes.

 

As a professional manufacturer and supplier of stainless steel boiler tubes, GNEE provides high-quality ASTM A213 TP316H stainless steel tubes, specifically designed for high-pressure and high-temperature steam service.

 

Our TP316H tubes undergo a strictly controlled solution annealing process (above 1040°C) followed by rapid cooling, ensuring a uniform microstructure and effective stress relief. The grain size is precisely controlled within ASTM 5–8 levels, achieving a creep rupture strength exceeding 100 MPa at 600°C, which guarantees reliable performance under long-term high-temperature conditions.

316H SS tubes fully comply with ASTM A213 dimensional tolerance standards, with outer diameter tolerance controlled within ±0.3% and wall thickness uniformity within ±10%, significantly reducing the risk of leakage during installation.

 

More importantly, we address internal contamination issues commonly found in boiler applications. ASTM A213 TP316H stainless steel boiler tubes are treated with internal surface cleaning and passivation processes, achieving an internal surface roughness of ≤ Ra 0.8 μm. This effectively minimizes scaling, deposit buildup, and flow resistance, ensuring improved heat transfer efficiency and longer service life.

 

ASME SA 213 TP316H pipe Chemical Composition

Grade	–	C	Mn	Si	P	S	Cr	Mo	Ni	N
ASTM A213 ASME SA213 TP316H S31609	min.max.	0.04 – 0.10	-2.00	-1.00	-0.045	-0.030	16.0-18.0	2.00-3.00	11.0-14.0	–

 

Mechanical Properties of SA213 TP316H Stainless Steel SMLS Pipe in the Annealed Condition

			Tensile Strength	Yield Strength
Alloy	UNS	Spec.	MPa	ksi	ksi	MPa	Elongation in 2 inch (min.) %	Grain Size Req.	Max. Hardness HRB Rockwell
TP316H	S31609	A213	515	75	30	205	35	7 or coarser	90 HRB

 

Physical Properties of ASME SA213 TP316H Stainless Steel Pipe

Alloy	UNS	Spec.	Density Specific Gravity kg/dm³	Modulus of Elasticity (x106 psi)	Mean Coeff icient of Thermal Expansion (IN./IN ./°F x 10-6)	Thermal Cond uctivity (BTU-in/ft2-h-°F)
316H	S31609	A213	7.98	28.0	9.2	116

 

Applications of 316H Stainless Steel Round Tubes

316H alloy tubing is most commonly utilized in oil refineries. Furthermore, it is widely applied in stainless steel reheater and superheater tubes for boilers, heat exchanger tubes, condenser tubes, piping systems, cooling towers, steam exhaust assemblies, and power generation plants.

 

 

We operate 22 cold rolling mills and 5 cold drawing machines to ensure rapid production completion and timely delivery. We are capable of manufacturing extra-long stainless steel seamless tubes, reaching a maximum length of up to 60,000 mm.
Specification Range: Outer Diameter (OD) ranges from 6.35 mm to 127 mm, and Wall Thickness (WT) ranges from 0.89 mm to 12.7 mm (primarily covering standard specifications commonly used in boiler applications).
Annual Production Capacity: Our annual production capacity for stainless steel tubes exceeds 3,000 tons; our inventory includes a ready stock of boiler-grade tubes such as TP316H, TP347H, and TP321H.
Lead Time: Common specifications are available for rapid shipment within 3 to 7 days, while the production cycle for customized orders typically ranges from 25 to 45 days.

Quality Inspection

Chemical Analysis & PMI Testing:
Grain Size Test:
Flattening Test: Ensures the ductility of the tubing.
Flaring Test: Simulates deformation capabilities during tube-to-tubesheet connections.
Eddy Current Testing (ET): Detects surface and near-surface defects.
Ultrasonic Testing (UT): Conducts deep-level detection of internal slag inclusions and cracks within the tube wall.
Hydrostatic Test: Verifies overall leak-tightness under high-pressure conditions.

Export Standard Packaging

End Protection: Both ends of every pipe are fitted with thickened plastic end caps to prevent dust ingress and protect the bevels.
Individual Protection: Each steel pipe is enclosed in a separate plastic sleeve to prevent mechanical scratches caused by friction between pipes.
Bundling and Reinforcement: Small-diameter pipes are bundled in a hexagonal configuration, while large-diameter pipes are fitted with rubber spacers.
Outer Packaging: Thickened, fumigation-free plywood cases are utilized for outer packaging, lined internally with waterproof fabric and desiccant.