Heatresistant castings

ÈSN 42 2934 | ÈSN 42 2936 | ÈSN 42 2944 | ÈSN 42 2951
ÈSN 42 2952 | ÈSN 42 2955 | explanation notes

Conversion table of produced steels. We prefer to supply final product according to Chomutov marking. On special customer´s request is possible to supply castings according to other standard.

Marking of
Chomutov		 EU
EN
WNr.		 DE
marked by DIN		 FRA
AFNOR		 UK
BSI		 ITA
UNI
ÈSN 42 2934 GX40CrNiSi22 10 1.4826 GX40CrNiSi22 9 Z25CN20.10M 309 C 30 GX30CrNi20 10
ÈSN 42 2936 GX40CrNiSi25 12 1.4837 GX40CrNiSi25 12 Z40CN25.12M 309 C 32/35 GX40CrNi25 12
GX40CrNiSi25 12 GX40CrNiSi25 12 1.4837 GX40CrNiSi25 12 Z40CN25.12M 309 C 32/35 GX40CrNi25 12
ÈSN 42 2944 GX40CrNiSi25 12 1.4837 GX40CrNiSi25 12 - 309 C 32/35/40 GX35CrNi28 09
X15CrNiSi25 21 - 1.4841 X15CrNiSi25 21 Z15CN3 25 20 310 S 24 X16CrNiSi25 20
ÈSN 42 2951 - - - - - -
ÈSN 42 2952 GX40CrNiSi25 20 1.4848 GX40CrNiSi25 20 Z40CN30.20M 310 C 40/C45 GX40CrNi25 20
ÈSN 42 2955 GX40NiCrSi38 19 1.4865 GX40CrNiSi38 18 - 330 C 11/331 C40 GX50NiCr39 19

Some types of castings are also roughted or machined according to our possibilities.

ÈSN 42 2934 (Cr-Ni steel)

Chemical composition in percents

C Mn Si P S P+S Cr Ni
0.25 max. 1.00 max. max. max. 20.00 9.00
0.45 1.50 2.00 0.045 0.040 0.075 23.00 11.00

The castings are delivered stabilizing annealing (+SR).

Mechanical properties and values

Tensile strength Rm N/mm2 ≥ 441
Yield point Rp 0.2 Re N/mm2 ≥ 206
Elongation A % ≥ 10
Hardness - HB 180 - 250

*) The mechanical values Z, KC and K are not decisive at room temperature. This steel is intended for the stress under high temperatures up to 1000°C. With an increase in the amount of carbon the values of Rm rise up to by 200 N/mm2; Re by up to about 100 N/mm2. The values of A and KC however decline. The tendency to rise remains preserved in austenitized condition, even after long term annealing at 650-800°C.

The highest permitted operating temperature

  • permanent load: ≤ 950°C
  • short-term load: ≤ 1000°C

Maximum permissible heat load and resistance to sulphur products in atmospheres

  • oxidizing + air
    sulfur-free ≤ 950°C
    max. 2 g S/m3 ≤ 930°C
    min. 2 g S/m3 ≤ 850°C
  • reducing + carburizing
    sulfur-free ≤ 900°C
    max. 2 g S/m3 ≤ 850°C
    min. 2 g S/m3 unsuitable

Yield point Rp 1 (1 % elongation) in temperatures after 10 000 hours of static stress

  • 700°C ≥ 41 N/mm2
  • 800°C ≥ 20 N/mm2
  • 900°C ≥ 9 N/mm2
  • Weldability
    Good. Up to a thickness of 25 mm preheating is not necessary. Over 25 mm preheat to at least 150°C. After welding, cool in water. New annealing is not necessary.
  • Machinability
    Good to difficult.
  • Application
    Mechanically stressed parts of continuous and chamber furnaces (guide angles), conveyor rollers, rails in low temperature zones, covers of shaft furnaces, etc. The vessels for salt bath where the melt temperature is lower. The material is not to be used as corrosion resistant, but as scale resistant.

ÈSN 42 2936 (Cr-Ni steel)

Chemical composition in percents

C Mn Si P S P+S Cr Ni Mo
0.25 max. max. max. max. max. 24.00 12.00 max.
0.50 1.50 2.00 0.045 0.040 0.075 27.00 14.00 0.50

The castings are delivered stabilizing annealing (+SR).

Mechanical properties and values

Tensile strength Rm N/mm2 441 - 637
Hardness - HB 130 - 190

*) The mechanical values Z, KC and K are not decisive at room temperature. This steel is intended for the stress under high temperatures up to 1100°C. With an increase in the amount of carbon the values of Rm increase by up to about 200 N/mm2; Re by up to about 100 N/mm2. The values of A and KC, however, decline. The tendency to rise remains preserved in austenitized state, even after long term annealing at 650-800°C.

The highest permitted operating temperature

  • permanent load: ≤ 1050°C
  • short-term load: ≤ 1100°C
    The heat resistance and heat load can be increased by approximately 50°C when C-content is higher up to 0.55% and Si-content up to 2.50%. However in the same time the resistance to brittleness is getting lower in the temperature range 600-900°C. Such requirement is possible only on agreement between the buyer and manufacturer.

Maximum permissible heat load and resistance to sulphur products in atmospheres

  • oxidizing + air
    sulfur-free ≤ 1100°C
    max. 2 g S/m3 ≤ 1100°C
    min. 2 g S/m3 ≤ 1050°C
  • reducing + carburizing
    sulfur-free ≤ 1030°C
    max. 2 g S/m3 ≤ 1030°C
    min. 2 g S/m3 unsuitable

Yield point Rp 1 (1 % elongation) in temperatures after 10 000 hours of static stress

  • 700°C ≥ 44 N/mm2
  • 800°C ≥ 22 N/mm2
  • 900°C ≥ 11 N/mm2
  • 1000°C ≥ 4.5 N/mm2
  • Weldability
    Good. Up to a thickness of 25 mm preheating is not necessary. Over 25 mm preheat to at least 200°C. After welding, cool in water. New annealing is not necessary.
  • Machinability
    Good to difficult
  • Application
    Mechanically stressed parts of metallurgical furnaces, rails, annealing retorts and pots, conveyor chain links, etc.
    Not applicable at temperatures under 900°C the steel is getting brittle. The material is not to be used as corrosion resisting, but scale resisting.

ÈSN 42 2944 (Cr-Ni steel)

Chemical composition in percents

C Mn Si P S P+S Cr Ni
0.35 max. max. max. max. max. 26.00 8.00
0.60 1.00 2.00 0.045 0.040 0.075 28.50 10.00

The castings are delivered stabilizing annealing (+SR).

Mechanical properties and values

Tensile strength Rm N/mm2 490 - 785
Yield point Rp 0.2 Re N/mm2 ≥ 343
Hardness - HB 145 - 235

*) The mechanical values Z, KC and K are not decisive at room temperature. This steel is intended for the stress under high temperatures up to 1200°C.

The highest permitted operating temperature

  • permanent load: ≤ 1050°C
  • short-term load: ≤ 1100°C

Maximum permissible heat load and resistance to sulphur products in atmospheres

  • oxidizing + air
    sulfur-free ≤ 1200°C
    max. 2 g S/m3 ≤ 1170°C
    min. 2 g S/m3 ≤ 1040°C
  • reducing + carburizing
    sulfur-free ≤ 1050°C
    max. 2 g S/m3 ≤ 1030°C
    min. 2 g S/m3 ≤ 1070°C

Yield point Rp 1 (1 % elongation) in temperatures after 10 000 hours of static stress

  • 700°C ≥ 31 N/mm2
  • 800°C ≥ 15 N/mm2
  • 900°C ≥ 7 N/mm2
  • 1000°C ≥ 2.5 N/mm2
  • Weldability
    Difficult. It is better to avoid welding connections - this involves certain difficulties. It is necessary to preheat the steel to minimum 400°C. At deep weldings up it is better to use the proper root electrode.
    The covering patch is to be done by short weld beads, to be hammered immediately. New annealing is necessary after welding.
  • Machinability
    Good to difficult
  • Application
    For the castings subjected to the most temperatures and mechanical stress. Parts of annealing, roasting, harden furnaces in reduction atmospheres, where SO2 is present. In pots for salt baths with high temperatures of melt. At temperatures under 900°C, the steel is getting brittle. The brittleness disappears at temperatures over 950°C

ÈSN 42 2951 (Cr-Ni steel)

Chemical composition in percents

C Mn Si P S Cr Ni Ti Al
0.20 max. 1.50 max. max. 20.00 37.00 0.05 1.00
0.30 0.50 2.00 0.040 0.040 22.00 40.00 0.20 1.50

The castings are delivered as austenitized (+AT).

Mechanical properties and values

Tensile strength Rm N/mm2 ≥ 441
Yield point Rp 0.2 Re N/mm2 ≥ 245
Elongation A % ≥ 5
Notch impact toughness KCU3 KC J/cm2 ≥ 15
Hardness - HB 145 - 230

Maximum permissible heat load and resistance to sulphur products in atmospheres

  • oxidizing + air
    sulfur-free ≤ 1120°C
    max. 2 g S/m3 ≤ 1080°C
    min. 2 g S/m3 ≤ 1050°C
  • reducing + carburizing
    sulfur-free ≤ 1080°C
    max. 2 g S/m3 ≤ 1000°C
    min. 2 g S/m3 ≤ 950°C

Yield point Rp 1 (1 % elongation) in temperatures after 10 000 hours of static stress

  • 700°C ≥ 62 N/mm2
  • 800°C ≥ 37 N/mm2
  • 900°C ≥ 19 N/mm2
  • 1000°C ≥ 9 N/mm2
  • 1100°C ≥ 2 N/mm2
  • Weldability
    Difficult. The steel is not suitable for welding. In unavoidable situations, it is necessary to preheat the steel to 150°C. It is necessary to weld by short interrupted weld beads and immediately heat forge with hammer.
    The resistance to carburization is reduced in welded areas. New austenization is necessary after welding.
  • Machinability
    Good
  • Application
    The steel is resistant to carburization in waste gas environments containing SO2. It has high mechanical values in high temperatures. It is suitable for grates of continuous and chamber case hardening furnaces and their constructions. For transport hooks and for the jigs of pit cementation furnaces with long service life. For parts of walking beam furnaces with varying temperatures, etc.
    When used in temperatures under 900°C, the steel is getting brittle. The brittleness disappears at temperatures over 900°C.

ÈSN 42 2952 (Cr-Ni steel)

Chemical composition in percents

C1 Mn Si P S P+S Cr Ni Mo
0.30 max. 0.75 max. max. max. 24.00 20.00 max.
0.45 1.50 1.75 0.045 0.040 0.075 27.00 22.00 0.50

The castings are delivered stabilizing annealing (+SR).

Mechanical properties and values

Tensile strength Rm N/mm2 ≥ 441
Yield point Rp 0.2 Re N/mm2 ≥ 216
Elongation A % ≥ 10
Hardness - HB 130 - 220

1) On request of the customer and after agreement with the producer, it is possible to deliver the steel containing < 0.20% C. Thereby, the steel gains a higher resistance to corrosion. At the same time, the amounts of Re and HB are lowered slightly. This results in increasing in the values A, Z, K and K.

Maximum permissible heat load and resistance to sulphur products in atmospheres

  • oxidizing + air
    sulfur-free ≤ 1150°C
    max. 2 g S/m3 ≤1100°C
    min. 2 g S/m3 unsuitable
  • reducing + carburizing
    sulfur-free ≤ 1080°C
    max. 2 g S/m3 ≤ 1040°C
    min. 2 g S/m3 unsuitable

Yield point Rp 1 (1 % elongation) in temperatures after 10 000 hours of static stress

  • 700°C ≥ 60 N/mm2
  • 800°C ≥ 36 N/mm2
  • 900°C ≥ 18 N/mm2
  • 1000°C ≥ 8 N/mm2
  • Weldability
    Good. Preheating is not necessary with thicknesses up to 20 mm. Over 20 mm, the steel must be preheated to a minimum of 200°C. Cool in water after welding. New annealing is not needed after welding if the steel is to be used as heat resistant. In case ad 1), it is necessary annealing for the stress relieving .
  • Machinability
    Good
  • Application
    The steel is suitable for equipment, jigs, and tools for the ceramic and glass industries. For vessels for hardening salt baths with direct heating by submersion electrodes and with external heating of the vessels. For high strength and stressed transport equipment parts inside furnaces, etc.

ÈSN 42 2955 (Cr-Ni steel)

Chemical composition in percents

C1 Mn Si P S P+S Cr Ni
0.20 max. 1.00 max. max. max. 20.00 37.00
0.60 1.50 2.00 0.045 0.040 0.075 22.00 40.00

The castings are delivered stabilizing annealing (+SR).

Mechanical properties and values

Tensile strength Rm N/mm2 ≥ 539
Yield point Rp 0.2 Re N/mm2 ≥ 196
Elongation A % ≥ 10
Hardness - HB 160 - 235

Maximum permissible heat load and resistance to sulphur products in atmospheres

  • oxidizing + air
    sulfur-free ≤ 1170°C
    max. 2 g S/m3 ≤1130°C
    min. 2 g S/m3 unsuitable
  • reducing + carburizing
    sulfur-free ≤ 1030°C
    max. 2 g S/m3 ≤ 1050°C
    min. 2 g S/m3 unsuitable
    Short-term heat overload by 30°C over the above mentioned temperatures permitted.

Yield point Rp 1 (1 % elongation) in temperatures after 10 000 hours of static stress

  • 700°C ≥ 58 N/mm2
  • 800°C ≥ 34 N/mm2
  • 900°C ≥ 19 N/mm2
  • 1000°C ≥ 7 N/mm2
  • 1100°C ≥ 2 N/mm2
  • Weldability
    Good - up to 0.40% C content. Neither preheating or new annealing are necessary after welding.
    Good to difficult when the steel contains more than 0.40% C. Preheating to 200°C is required. Weld with short interrupted weld beads and forge immediately. After welding is recommended a new annealing.
  • Machinability
    Good
  • Application
    For use in high temperature zones where the amount of heat varies, especially in oxidation atmospheres without the presence of sulphur and its combustion gas.
    The steel is suitable for movable grates, beams, loading jigs for the glass furnaces, glass crucibles etc.
    The steel is not susceptible to brittleness. It is not suitable for sulphur containing reduction atmospheres.
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