WITTE | HiTEMP | Stock Program | 1.4878

1.4878 || AISI 321H

Austenitic heat-resistant chromium-nickel steel

The 1.4878 is an austenitic heat-resistant chromium-nickel steel stabilized with titanium. It is chemically similar to 1.4541. The difference lies in the carbon content.

Heat-resistant Stainless Steel

1.4878 || AISI 321H

General properties in processing:

Good machinability
Good weldability

Distinguishing properties:

Scale resistant up to 850 °C

Corrosion resistance:

In oxidizing media up to 850 °C
In oxidizing and sulfur-containing media up to 750 °C

Applications:

Apparatus and container construction
Automotive industry
Chemistry and petrochemistry
Industrial furnace construction
Pulp and paper industry

Chemical values – Reference analysis (weight proportion in %)

C	0,04 – 0,10
Si	max 1,0
Mn	max 2,0
P	max 0,045
S	max 0,015
Cr	17,0 – 19,0
Ni	9,0 – 12
Ti	5xC – 0,8

Mechanical values at room temperature

Hardness HB	≤ 215
Yield strength Rp 0.2	≥ 190 N/mm²
Tensile strength Rm	550 – 700 N/mm²
Elongation A5	≥ 40 %

Creep strength

Creep strength is the mechanical initial stress that causes a material to break after a certain period of stress duration and at a constant temperature above the transition temperature under constant tensile force.

Temperature	1 000 h	10 000 h	100 000 h
Temperature: 600 °C	1 000 h : 200 N/mm²	10 000 h: 142 N/mm²	100 000 h: 65 N/mm²
Temperature: 700 °C	1 000 h : 88 N/mm²	10 000 h: 48 N/mm²	100 000 h: 22 N/mm²
Temperature: 800 °C	1 000 h : 30 N/mm²	10 000 h: 15 N/mm²	100 000 h: 10 N/mm²

Creep limit

Creep limit is the initial stress that leads to a specified plastic deformation under constant tensile stress at a predetermined temperature and duration of stress.

Temperature	1 % Creep limit for 1,000 h	10 000 h
Temperature: 600 °C	1 % Creep limit for 1,000 h: 110 N/mm²	10 000 h: 85 N/mm²
Temperature: 700 °C	1 % Creep limit for 1,000 h: 45 N/mm²	10 000 h: 30 N/mm²
Temperature: 800 °C	1 % Creep limit for 1,000 h: 15 N/mm²	10 000 h: 10 N/mm²

Coefficient of thermal expansion

Coefficient of thermal expansion for heat-resistant alloys, which have a high coefficient of thermal expansion and low thermal conductivity, leading to temperature and stress differences in a component or assembly. The coefficient of thermal expansion is expressed by the proportional length change for each degree of temperature increase, usually as 10 ^–6 K ^–1.

Temperature	Coefficient of thermal expansion
Temperature: 200 °C	Coefficient of thermal expansion: 17,0
Temperature: 400 °C	Coefficient of thermal expansion: 18,0
Temperature: 600 °C	Coefficient of thermal expansion: 18,5
Temperature: 800 °C	Coefficient of thermal expansion: 19

Standards for pipes

EN 10216-5
EN 10297-2
ASME SA312

The information provided on this page is non-binding. It serves only as orientation.
We cannot guarantee the results in processing and application of the products.