UNS S30815|1.4835|253MA Seamless Stainless Steel Tube

Seamless Stainless Steel 253MA Tubes (UNS S30815 / W.Nr. 1.4835) are high-performance austenitic heat-resistant solutions engineered for superior thermal stability and mechanical strength. As a premier manufacturer based in Wenzhou, China, XinZhe produces high-integrity seamless tubing that strictly adheres to ASTM A213, ASTM A312, and EN 10297-2 international standards.

Distinguished by the strategic addition of Rare Earth Metals (Cerium) and a high Silicon (Si) content, our 253MA tubing develops a tenacious, slow-growing oxide scale that ensures exceptional resistance to oxidation and isothermal scaling at temperatures up to 1150°C (2102°F). Compared to standard stainless steels, 253MA offers significantly higher creep-rupture strength, making it indispensable for mission-critical applications in boiler baffles, furnace components, and exhaust manifolds. Through advanced cold-drawing and specialized solution annealing, XinZhe ensures every tube maintains a uniform microstructure and high-integrity surface finish.

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What Is a Seamless Stainless Steel 253MA Tube?

253MA (UNS S30815) is a micro-alloyed austenitic stainless steel with rare-earth additions, developed for high-temperature service. The combination of 21% chromium, 11% nickel, silicon and cerium delivers outstanding oxidation resistance and creep-rupture strength at temperatures up to about 1,150 °C, which makes it a first choice for furnace and heat-treatment equipment.

Seamless Stainless Steel 253MA Tube(UNS S30815 / W.Nr. 1.4835) is a high-performance heat-resistant stainless steel tube manufactured from a solid billet through hot extrusion and cold drawing processes without any welded joints. The seamless structure provides uniform metallurgical properties, excellent pressure resistance, and superior reliability in demanding industrial environments.

Compared with welded tubing, 253MA seamless tubes offer enhanced structural integrity, improved creep strength, and higher safety performance under elevated temperatures and mechanical stress. These characteristics make them particularly suitable for high-temperature industrial systems requiring long-term stability and oxidation resistance.

253MA stainless steel (designation: UNS S30815 / EN 1.4835) is a lean austenitic heat-resistant stainless steel developed specifically for high-temperature applications.

The alloy contains optimized additions of nitrogen, silicon, and the rare-earth element cerium, which significantly enhance oxidation resistance and creep-rupture strength. This unique alloy design enables the material to maintain structural stability and surface integrity in temperatures up to 1100 °C (2000 °F).

As a result, 253MA stainless steel tubes are widely used in furnace equipment, thermal processing systems, and high-temperature chemical environments.

Key Features and Technical Advantages

253MA stainless steel forms a stable and adherent oxide layer that protects the tube surface from oxidation and scaling in high-temperature atmospheres.

Micro-alloying with nitrogen and rare-earth elements improves long-term creep resistance, making the material suitable for continuous high-temperature service.

253MA tubes perform effectively in moderately corrosive and high-temperature industrial environments, including oxidizing and carburizing atmospheres.

Outstanding High-Temperature Oxidation Resistance

253MA stainless steel forms a stable and adherent oxide layer that protects the tube surface from oxidation and scaling in high-temperature atmospheres.

Superior Creep-Rupture Strength

Micro-alloying with nitrogen and rare-earth elements improves long-term creep resistance, making the material suitable for continuous high-temperature service.

Reliable Corrosion Resistance

253MA tubes perform effectively in moderately corrosive and high-temperature industrial environments, including oxidizing and carburizing atmospheres.

High Pressure and Temperature Capability

The seamless manufacturing process ensures excellent mechanical strength and allows safe operation under high internal pressure and elevated temperatures.

Good Weldability and Fabrication

253MA stainless steel can be welded using conventional welding processes without significant loss of corrosion resistance or mechanical properties.

Product Specifications and Data

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Stainless Steel 253MA.

The composition of Stainless Steel 253MA is carefully balanced to achieve its superior high-temperature oxidation resistance and creep strength.

Cr	Ni	P	S	Ce	N	Mn	Si	C
20.00 - 22.00	10.00 - 12.00	≤ 0.04	≤ 0.03	0.03 - 0.08	0.14 - 0.20	≤ 0.80	1.40 - 2.00	0.05 - 0.10

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 600 MPa	≥ 310 MPa	≥ 40%	≤ 200 HBW

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
7.8 g/cm³	1400 - 1450 °C approx.	17.0 µm/m·°C (20-100°C)	15.0 W/m·K (20°C)	195 GPa	0.72 x 10⁻⁶ Ω·m (20°C)

Standard	OD(D)	Tolerance（MM)		Thickness(S)	Tolerance(MM)	Length	Tolerance
	MM	Common	High	MM			MM
EN 10216-5 HFD	30≤D≤219.1（D2)	±1.0% or ±0.5mm, whicever is the greater(取较大者)		T1, T≤4	±15% or ±0.6mm, whicever is the greater(取较大者)	L≤6M	+5/0
				T2	±12.5% or ±0.4mm, whicever is the greater(取较大者)
	219.1≤D≤610 (D1)	±1.5% or ±0.75mm, whicever is the greater (取较大者)		T≤0.05D	+22.5%/-15%	6≤12	+10/0
				T1, 0.05D≤0.09D	±15% or ±0.6mm, whicever is the greater(取较大者)
				T2, T>0.09D	±12.5% or ±0.4mm, whicever is the greater(取较大者)	L>12	+by agreement/0
EN 10216-5 CFD	D3(D≤219.1)	±0.75% or ±0.3mm, whicever is the greater(取较大者)		T3	±10% or ±0.2mm, whicever is the greater(取较大者)
	D4(D≤219.1)	±0.5% or ±0.mm, whicever is the greater(取较大者)		T4	±7.5% or ±0.15mm, whicever is the greater(取较大者)
ASTM A213 HFD	D≤100	+0.4/-0.8		D<100,S≤2.4	+40%/0	HFD, all size	+5.0/0
		+0.4/-1.2		D<100,2.4≤3.8	+35%/0
		+0.4/-1.6		D<100,3.8≤4.6	+33%/0
				D<100,S>4.6	+28%/0
	100≤200	+0.4/-1.2		D>100, 2.4≤3.8	+35%/0
	200≤225	+0.4/-1.6		D>100,3.8≤4.6	+33%/0
				D>100,S>4.6	+28%/0
ASTM A213 CFD	D<25	±0.10		D≤38.1	+20%/0	CFD, D<50.8	+3.0/0
	25≤D≤40	±0.15
	40	±0.20
	50≤D<65	±0.25
	65≤D<75	±0.30		D>38.1	+22%/0	CFD, D≥50.8	+5.0/0
	75≤D≤100	±0.38
	100≤200	+0.38/-0.64
	200≤225	+0.38/-1.14
ASTM A269	D≤13	±0.13		D≤13	±15%	D<38	+3.2/0
	13	±0.13		13	±10%
	38≤D<89	±0.25				D>38	+4.8/0
	89≤D<140	±0.38
	140≤D<203	±0.76
	203≤D<305	±1.01
	305≤D<356	±1.26
ASTM A270	D<25	±0.13		For weld pipe all size	±12.5%		+3.0/0
	25-50	±0.20
	50-75	±0.25
	75-100	±0.38		For CD SMLS pipe D≤38.1	+20%/0
	100-140	±0.38					+5.0/0
	140-200	±0.75		For CD SMLS pipe D>38.1	+22%/0
	200-300	±1.25

Dimensional Standards and Tolerances

253MA seamless tubes are supplied to the dimensional tolerances of ASTM A213 / A1016 or EN 10216-5 as specified.

Common Industrial Applications

Heat Treating and Furnace Industry

Radiant tubes and muffles
Furnace internals and supports
Heat-treatment fixtures

Power Generation

Boiler and superheater components
Reheater tubing
Steam generator parts

Petrochemical Processing

Furnace tubing and burner parts
Reformer internals
High-temperature piping

Cement and Lime Industry

Kiln internals
Calciner and preheater parts
High-temperature process equipment

Quality Assurance and Manufacturing Process

Certification

All 253MA (UNS S30815) tubes are supplied to ASTM A213 / ASME SA213 and EN 10216-5 with EN 10204 3.1 mill test certificates. Third-party inspection (SGS, BV, TUV, Lloyd's), PMI reports and full heat-number traceability can be provided on request.

Non-Destructive Testing (NDT)

Hydrostatic or eddy-current testing is performed on 100% of tubes. Ultrasonic testing (UT) and dye-penetrant inspection (PT) are available for critical service, with records retained for each production lot.

Material Verification

Positive Material Identification (PMI) and spectrometric analysis confirm that the chemical composition matches the ordered grade and that the ferrite/austenite balance is within the specified range.

Mechanical Testing

Tensile, yield, elongation and hardness tests are carried out per heat. Impact testing can be supplied at the project design temperature for subsea and low-temperature service.

Dimensional Inspection

Outside diameter, wall thickness, ovality and straightness are measured against ASTM A1016 / A1016M or ASTM A789 tolerances. Length, square-cut ends and end-finish conditions are verified before packing.

253MA vs TP310 / TP309 – Technical Comparison

253MA and the 25Cr-20Ni grades are all selected for high-temperature service, but they resist different failure mechanisms.

Chemical Composition

253MA (S30815): ~21% Cr, ~11% Ni, ~1.6% Si, with cerium and nitrogen
TP310: 24–26% Cr, 19–22% Ni, no rare-earth addition
TP309: 22–24% Cr, 12–15% Ni, no rare-earth addition

Oxidation Resistance

The rare-earth (cerium) addition in 253MA is what makes the difference: it produces an exceptionally adherent oxide scale that resists spalling under severe thermal cycling, letting 253MA serve to about 1,150 °C in cyclic oxidation — above the practical limit of TP310 at roughly 1,050 °C.

Creep Strength

253MA also delivers high creep-rupture strength in the 600–900 °C range, comparable to or better than the 25Cr-20Ni grades, which is why it is used for furnace rollers and supports where both creep and cyclic oxidation matter.

Selection Guide

Choose 253MA for severe cyclic oxidation and creep-limited high-temperature components
Choose TP310 / TP310H where the 25Cr-20Ni chemistry is specified or where nickel content must be higher for structural stability
Choose TP309 for moderately elevated temperature at lower cost

Frequently Asked Questions

What is 253MA tube?

253MA (UNS S30815) is a micro-alloyed austenitic stainless steel tube with rare-earth additions, developed for high-temperature service. Its 21% chromium, 11% nickel, silicon and cerium content deliver outstanding oxidation resistance and creep-rupture strength up to about 1,150 °C.

Why does 253MA resist high-temperature oxidation so well?

The cerium (rare-earth) addition produces an exceptionally adherent oxide scale that resists spalling under severe thermal cycling. Combined with the silicon content, this lets 253MA serve at temperatures above the practical limit of the 25Cr-20Ni grades.

What standard covers 253MA tube?

253MA seamless tube is supplied to ASTM A213 / ASME SA213 and EN 10216-5, with dimensional tolerances per ASTM A1016 / A1016M.

What is 253MA tube used for?

253MA is used for radiant tubes and muffles, furnace internals and supports, boiler and superheater components, and high-temperature petrochemical furnace tubing.

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Send your Seamless Stainless Steel 253MA Tube enquiry with grade, application, size (OD and wall thickness or schedule), quantity, length, end finish and inspection requirements including any high-temperature test data required.

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