X10CrMoVNb9-1 / 1.4903

Euronomy	Execution	Material	ASTM, ASME	W.Stoff	Operating temp.	PDF	RFQ
X10CrMoVNb9-1 / 1.4903	Plates, Forgings, Seamless tubes, Bars	Alloyed boilersteel, Stainless, acid & heat resistant steel	Plate: A/SA 387 gr 91. Round steel: A/SA 182 F91. Pipe: A/SA 335 P91	1.4903	max. approx. 650°C

1.4903 a high performance material well suited for use in extreme temperature and pressure environments.

1.4903 is an alloyed martensitic pressure vessel steel, designed to be a heat resistant steel that provides good creep resistance. The steel also has an increased impact strength.

The low carbon content gives the steel properties that are particularly suitable for both mechanical processing and welding. 1.4903 is a material used in applications where conventional heat-resistant steels are unable to fulfil the requirements.

Due to its excellent resistance to oxidation, creep and high temperature strength, the steel is often used in high temperature applications such as power plants, chemical plants and oil refineries.

Dimension Sheet metal	6 - 60 mm
Dimension Round bar	Ø 20 - 700 mm
Forging	Yes
Tubes	Yes
Tensile strength	min. 450 N/mm²
Offence threshold	580 - 760 N/mm²
Toughness	+20°C / 40J
Composition AI	min. 0,040
Composition C	0,08 - 0,12
Composition CR	8,00 - 9,50
Composition Cu	max. 0,30
Composition Mn	0,30 - 0,60
Composition Mo	0,85 - 1,05
Composition N	0,030 - 0,070
Composition Nb	0,06 - 0,10
Composition Ni	max. 0,30
Composition P	max. 0,020
Composition S	max. approx. 650°C

Classified pressure vessel steel from Livallco

We at Livallco are one of the few steel wholesalers in the world who stock material 1.4903. We stock X10CrMoVNb9-1 in thickness 6-50 mm. Our plate is always delivered with classification according to national standards:

EN 1.4903 / X10CrMoVNb9-1 / ASTM A 387 / ASME SA 387 / Grade 91
EN 10160 S2/E3 and ASTM A57 (ultrasound tested).

Do you have questions about our steels? Feel free to contact us and we will help you further!

Areas of use

X10CrMoVNb9-1 has several applications in different types of heavy industry. The steel is designed to withstand creep resistance at high working temperatures up to 600 °C. Common uses and applications are for example

pipelines and pipe holding systems for steam in energy production processes
heavy section components in thermal power plants
pressure vessel applications for refining and in nuclear power plants
different types of steam boilers
valve systems in the gas and oil industry.

Manufacture and characteristics

When producing 1.4903, the aim is to make the material particularly clean, homogeneous and reproducible. The pressure vessel steel is produced in furnaces using processes such as LD converters, which ensure that the final steel produced can withstand welding, high creep resistance and impact resistance in heat-affected zones. It also gains high resistance to hydrogen attack. Compared to standard stainless steels, 1.4903 has a lower tendency to be activated by irradiation.

Looking for other types of pressure vessel steel?

Livallco stocks a wide range of both alloy and non-alloy pressure vessel steel.