1.4720 Stainless Steel Complete Guide

Introduction to 1.4720 Stainless Steel

1.4720 stainless steel, commonly known as X10CrAlSi18 or UNS S13800, is a ferritic heat-resistant stainless steel with excellent high-temperature oxidation resistance due to its high chromium and aluminum content. The combination of 17-19% chromium and 0.70-1.20% aluminum promotes the formation of a highly stable, adherent aluminum-chromium oxide scale that provides superior protection against scaling and oxidation at elevated temperatures up to 950°C. This makes it an ideal material for demanding high-temperature applications where resistance to thermal cycling and corrosion is required, such as furnace components, heat treatment equipment, and industrial heating systems.

 

Equivalent Grades of 1.4720 Stainless Steel

Standard	Grade
German SEW	1.4720 / X7CrTi12
Chinese GB	06Cr12Ti
ASTM	AISI 409 / UNS S40900
EN	1.4512 (X2CrTi12)

 

Chemical Composition of 1.4720 Stainless Steel

Element	C	Si	Mn	P	S	Cr	Ti
Content	≤0.08	≤1.00	≤1.00	≤0.040	≤0.030	10.50‑12.50	≥6×C, ≤1.0

 

 Physical Properties (20 ℃ room temperature) of 1.4720 Stainless Steel

Item	Value
Density	7.75 g/cm³
Modulus of Elasticity	210 GPa
Coefficient of Linear Expansion	10.5×10⁻⁶ /℃ (20‑400℃)
Thermal Conductivity	24 W/(m·K)
Specific Heat Capacity	460 J/(kg·℃)
Microstructure	Ferritic, magnetic
Max long‑term service temperature	≤750 ℃

 

Mechanical Properties (annealed condition, room temperature) of 1.4720 Stainless Steel

Property	Value
Tensile Strength Rm	400‑600 MPa
0.2% Offset Yield Strength Rp0.2	≥210 MPa
Elongation A	≥25 %
Brinell Hardness HBW	≤179

Key Characteristics of 1.4720 Stainless Steel

What is the high-temperature oxidation performance of 1.4720 ?
1.4720 delivers excellent high-temperature oxidation resistance. The high chromium content (17-19%) and aluminum element (0.70-1.20%) jointly form a stable and tightly bonded aluminum-chromium oxide protective layer.1.4720 can effectively resist surface scaling and oxidation failure, with a continuous working temperature up to 950°C (1740°F).

 

How about the thermal fatigue resistance of the 1.4720?

1.4720 ferritic stainless steel features outstanding thermal fatigue resistance. 1.4720 unique ferritic microstructure strongly adapts to frequent thermal cycling environments, maintaining stable performance under repeated heating and cooling conditions.

 

Can 1.4720 adapt to harsh industrial atmospheres?

Yes. 1.4720 has superior resistance to sulfur-containing and carburizing atmospheres. 1.4720 can work stably in high-sulfur and carburizing industrial environments where ordinary austenitic stainless steels are prone to corrosion and performance degradation.

 

What are 1.4720 cost advantages compared with traditional heat-resistant steel?

This nickel-free ferritic grade has a significant cost advantage. Without expensive nickel alloy elements, 1.4720 is far more economical than conventional nickel-containing austenitic heat-resistant stainless steels while retaining excellent high-temperature comprehensive performance.

 

Applications of 1.4720 Stainless Steel

1.Furnace Components:

Radiant tubes, heating elements, furnace linings, burner parts, and support grids.

2.Heat Treatment Equipment:

Retorts, muffles, baskets, and trays for heat treating operations.

3.Industrial Heating:

Recuperators, heat exchangers, and radiant tube sheaths.

4.Petrochemical:

Components in moderate-temperature process equipment and reformers.

5.Automotive Exhaust:

Catalytic converter supports and exhaust manifolds for high-temperature applications.

6.Household Appliances:

Burner components in gas stoves, heater parts, and fireplace inserts.

Supplier Introduction of 1.4720 Stainless Steel

GNEE supplies a full range of export‑oriented 1.4720 ferritic heat‑resistant stainless steel products.Main export product categories include:

1.Sheets, Plates & Coils: Hot‑rolled / cold‑rolled sheets, medium‑thick plates, steel coils and slit strips.

2.Bars & Profiles: Hot‑rolled round bars, cold‑drawn & ground bars, square bars, flat bars and hex bars in black, rough‑turned or polished surfaces.

3.Pipes & Tubes: Seamless and welded heat‑resistant tubes for furnace piping and high‑temperature flue‑gas service.

4.Forgings: Forged rings, blocks and custom‑made high‑temperature components per customer drawings.

Meanwhile, GNEE strictly complies with relevant EN and DIN standards, supporting bulk export orders, small‑batch trial orders and sample delivery.

If you are looking for high-quality 1.4720 stainless steel products, we can provide you with professional purchasing solutions.

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FAQ

1.How does 1.4720 compare to 1.4762 (446) and 1.4713 (X10CrAlSi13)?
1.4720 offers performance between 1.4713 and 1.4762. With 17-19% chromium, it provides higher temperature capability than 1.4713 (12-14% Cr, suitable to 900°C) but lower than 1.4762 (23-27% Cr, suitable to 1100°C). The aluminum content provides additional oxidation resistance across all three grades. 1.4720 is often chosen for applications requiring higher temperature performance than 1.4713 but where the maximum capability of 1.4762 is not required. It offers an excellent balance of cost and performance for many industrial heating applications up to 950°C.

 

What are the welding considerations for 1.4720?
Welding 1.4720 requires care due to its ferritic structure and aluminum content. Key considerations include:

Low heat input welding techniques are essential to minimize grain growth in the heat-affected zone

Preheating (200-300°C) is recommended for thicker sections

Austenitic filler metals (309L, 310L) are recommended for better weld ductility

Post-weld annealing at 750-800°C may be required to restore ductility for critical applications

The aluminum content can affect weld pool fluidity and may require special techniques

Resistance welding is often preferred for thin gauge applications

For critical applications, welding should be performed with qualified procedures

 

What temperature range is 1.4720 suitable for?
1.4720 is suitable for continuous service up to approximately 950°C (1740°F) and intermittent service up to 1000°C (1830°F). It maintains good oxidation resistance within this range, making it suitable for furnace components, heat treating equipment, and industrial heating systems. For applications requiring higher temperature capability (above 950°C), 1.4762 with higher chromium content is recommended. The aluminum content provides excellent protection against scaling at elevated temperatures, but the material has limited creep strength above 850°C.