If you are looking for high-quality heat-resistant stainless steel pipes for high-temperature and corrosive environments, we offer 1.4878 stainless steel round pipes conforming to EN 10216-5 standards, ensuring stable and reliable quality, and providing global export services.

1.4878 (UNS S30815 / X15CrNiSi25-21) is a high-alloy austenitic stainless steel containing approximately 24-26% chromium and 19-22% nickel. It exhibits excellent oxidation resistance, carburization resistance, and thermal stability in continuous high-temperature environments, surpassing ordinary 310S stainless steel pipes.

Our 1.4878 stainless steel round pipes are manufactured using precision electric furnace melting, AOD refining, hot extrusion or seamless tube forming, solution annealing, and pickling processes, ensuring a uniform microstructure, smooth inner and outer surfaces, and strict dimensional tolerances. Product forms include 1.4878 seamless round tubes, 1.4878 thick-walled tubes, and 1.4878 SS welded tubes, with surface treatments including pickling, bright annealing, or grinding to meet different processing needs. Typical mechanical properties include tensile strength ≥520 MPa, elongation ≥40%, and hardness controlled at ≤200 HB. It is particularly suitable for high-temperature and high-pressure pipelines in thermal power, nuclear power, and petrochemical industries, extending equipment maintenance cycles by 30–50%, and is a critical material for ensuring long-term safe operation.

EN 10216-5 1.4878 Stainless Steel Pipe Manufacturing Process

Specifications

UNS S32109 Pipe Equivalent Material

GRADE	WERKSTOFF NR./ DIN	EN	UNS	AISI 321	JIS
SS 321H	1.4878	X12CrNiTi18-9	S32109	-	SUS 321H

Stainless Steel 321H Pipe Yield Strength

Elements	321H/ 1.4878, X8CrNiTi18-10, X12CrNiTi18-9
Ultimate Tensile strength	Rm: 500 - 720 N/mm2
Yield strength	Rp0, 2: >190N/mm2

AISI 321H Stainless Steel Pipe Mechanical Properties

Elements	321H/ 1.4878, X8CrNiTi18-10, X12CrNiTi18-9
Tensile stress	Rm: 500 - 720 N/mm2
Yield stress	Rp0, 2: >190N/mm2
Elongation	A: >40%
Modulus of elasticity	E: 200 GPa
Hardness	HB: <215

ASTM A312 TP 321H Pipe Wall Thickness Tolerance Chart

NPS	Wall Thickness Tolerance, %
	+	-
1/8 - 2 1/2	20	12.5
3 - 18, t/D ≤ 5%	22.5	12.5
3 - 18, t/D > 5%	15	12.5
≥ 20, welded	17.5	12.5
≥ 20, seamless, t/D ≤ 5%	22.5	12.5
≥ 20, seamless, t/D > 5%	15	12.5

GNEE welcomes customers to conduct inspections directly or to entrust third-party inspection agencies, including but not limited to internationally renowned organizations such as SGS, Bureau Veritas (BV), TÜV, and DNV. We provide a complete set of documents, including manufacturer test certificates (TC) conforming to EN 10204 Type 3.1 standard, raw material certificates, heat treatment/non-destructive testing (HT/NDT) reports, and third-party inspection reports.

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UNS S32109 Pipe and Tube Test Requirements

Eddy Current Test

Hydrostatic Tests

Ultrasonic Testing

Metalography Test

Visual Inspection

DP / MP / RF ECT Testing

CVN Impact Testing

TPP

Rockwell & BHN Hardness Testers

Highest quality packaging and shipping

All our stainless steel seamless pipes are packaged according to international standards to prevent any possible damage or loss. By default, we will bundle the finished pipes together in batches using thick woven plastic bags.

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