Stainless Steel 1.4724

This data sheet applies to hot and cold rolled sheet and strip, semi-finished products, bars, rods and sections.

Application

For construction parts, which should be resistant to scaling up to about 850°C and extensively inured to the effects of sulphurous gases. The inclination to carbonisation in reduced gases is very low.

Chemical Compositions*

Element% Present (in product form)
C, H, P, L
Carbon (C)0.12
Silicon (Si)0.70 - 1.40
Manganese (Mn)1.00
Phosphorous (P)0.040
Sulfur (S)0.015
Chromium (Cr)12.00 - 14.00
Aluminium (Al)0.70 - 1.20
Iron (Fe)Balance

Chemical Compositions*

Element% Present (in product form)
C, H, P, L
Carbon (C)0.12
Silicon (Si)0.70 - 1.40
Manganese (Mn)1.00
Phosphorous (P)0.040
Sulfur (S)0.015
Chromium (Cr)12.00 - 14.00
Aluminium (Al)0.70 - 1.20
Iron (Fe)Balance

Mechanical properties (at room temperature in annealed condition)

Product Form
C, H, PL
Thickness a or diamter d (mm)a ≤ 12d ≤ 25
Hardness HB max. 1) 2) 3)192
Proof Strength3)Rp0.2 N/mm2250
Rp1.0 N/mm2-
Tensile StrengthRm N/mm2450 - 650
Elongation min. in %Long Products3)15
Flat Products0.5 ≤ a/d < 3135)
3 ≤ a/d154)5)

Mechanical properties (at room temperature in annealed condition)

Product Form
C, H, PL
Thickness a or diamter d (mm)a ≤ 12d ≤ 25
Hardness HB max. 1) 2) 3)192
Proof Strength3)Rp0.2 N/mm2250
Rp1.0 N/mm2-
Tensile StrengthRm N/mm2450 - 650
Elongation min. in %Long Products3)15
Flat Products0.5 ≤ a/d < 3135)
3 ≤ a/d154)5)

Creep Properties (estimated average values about the long-term behaviour at elevated temperature*)

1% Elongation1) forRupture2) for
Temperature °C1,000 h N/mm210,000 h N/mm21,000 h N/mm210,000 h N/mm2100,000 h N/mm2
500805016010055
60027.517.5553520
7008.54.7179.55
8003.72.17.54.32.3
9001.81.03.61.91.0

Creep Properties (estimated average values about the long-term behaviour at elevated temperature*)

1% Elongation1) forRupture2) for
Temperature °C1,000 h N/mm210,000 h N/mm21,000 h N/mm210,000 h N/mm2100,000 h N/mm2
500805016010055
60027.517.5553520
7008.54.7179.55
8003.72.17.54.32.3
9001.81.03.61.91.0

Reference data on some physical properties

Density at 20°C kg/dm37.7
Thermal Conductivity W/m K at20°C21
500°C23
Specific Thermal Capacity at 20°C J/kg K500
Electrical Resistivity at 20°C Ω mm2 20°C 500°C /m0.75

Reference data on some physical properties

Density at 20°C kg/dm37.7
Thermal Conductivity W/m K at20°C21
500°C23
Specific Thermal Capacity at 20°C J/kg K500
Electrical Resistivity at 20°C Ω mm2 20°C 500°C /m0.75

Coefficient of linear thermal expansion 10-6 K-1 between 20°C and

200°C10.5
400°C11.5
600°C12.0
800°C12.5
1000°C-

Coefficient of linear thermal expansion 10-6 K-1 between 20°C and

200°C10.5
400°C11.5
600°C12.0
800°C12.5
1000°C-

Processing / Welding

Standard welding processes for this steel grade are:

  • TIG-Welding
  • MAG-Welding Solid Wire
  • Arc Welding (E)
  • Submerged Arc Welding (SAW)

Ferritic chrome steels are heat sensitive. Therefore the steel 1.4724 should be welded with lowest possible heat input by using thin electrode diameter, low current intensity and stringer bead welding. For wall thicknesses under 3mm, it is not necessary to preheat 1.4724. For thicker construction pars (>3mm) the preheating and interpass temperatures 200 - 300°C should not be under respectively over run. 1.4724 can be processed with similar or higher alloyed filler metals. With sulphurous atmospheres a ferritic top layer should be laid on the media side (Thermanit L 1.4820).

Cold Forming

When cold forming 1.4724, certain preventative measures should be observed. Sheets up to 3mm thickness can be cold bent if necessary preheating with 200 - 300°C should be done.
Products with thicknesses > 3mm must be preheated up to 600 - 800°C, concerning machinability 1.4724 can be compared to a low carbon steel.

Embrittlement

While heating 1.4724 over about 950 °C, embrittlement by grain growth occurs which cant be removed any more.

Note

The material is magnetizable.

Editor

thyssenkrupp Materials (UK) Ltd
Cox’s Lane
Cradley Heath
West Midlands
B64 5QU

Important Note

Information given in this data sheet about the condition or usability of materials respectively products are no warranty for their properties, but act as a description. The information, we give on for advice, comply to the experiences of the manufacturer as well as our own. We cannot give warranty for the results of processing and application of the products.