Creep-resistant and heat-resistant steel X15CrNiSi25-21, 1.4841, AISI 310, AISI 314 with austenitic structure designed for work in particularly high temperatures according to EN 10095, SEW 470, NF A35-573 and UNE 36017.

 

Standard Steel Grade
Chemical Composition %
C: Mn: Si: P: S: Cr: Ni: Mo: V: W: Cu: N:
PN H25N20S25
<0.2 <1.5 2.0 - 3.0 <0.045 <0.030 24.0 - 27.0 18.0 - 21.0 <0.5 <0.2 <0.5 <0.3 -
EN X15CrNiSi25-21 - X 15 CrNiSi 25-21 - X15CrNiSi2521 - 1.4841
<0.2 <2.0 1.5 - 2.5 <0.045 <0.015 24.0 - 26.0 19.0 - 22.0 - - - - <0.11
SEW 470 X15CrNiSi25-20 - X 15 CrNiSi 25-20 - X15CrNiSi2520 - 1.4841
<0.2 <2.0 1.5 - 2.5 <0.045 <0.015 24.0 - 26.0 19.0 - 21.0 - - - - <0.11
GOST 20Ch25N20S2 - 20Kh25N20S2 - 20Х25Н20С2
<0.2 <1.5 2.0 - 3.0 <0.035 <0.020 24.0 - 27.0 18.0 - 21.0 - - - - -
UNE F-3310 - F3310
<0.2 <2.0 1.5 - 2.5 <0.045 <0.030 24.0 - 26.0 19.0 - 21.0 - - - - -
AFNOR Z15CNS25-20 - Z 15 CNS 25-20
<0.15 <2.0 1.5 - 2.5 <0.04 <0.015 24.0 - 26.0 19.0 - 21.0 - - - - -
ASTM AISI 310 - SAE 30310 - UNS S31000
<0.25 <2.0 <1.5 <0.045 <0.030 24.0 - 26.0 19.0 - 22.0 - - - - -

 

X15CrNiSi25-21, 1.4841, AISI 314, AISI 310 - specification and application

High-alloy chromium-nickel-silicon steel with austenitic structure, heat-resistant up to 1150 ℃ (in practice up to 1100 ℃), creep-resistant up to 690 ℃, used for heavily loaded parts of equipment that require resistance to oxidation and numerous loads at high temperatures.

H25N20S2 steel is the right choice for components operating in a gas environment containing Nitrogen and Oxygen. Unfortunately, the grade does not show the same properties in contact with Sulfur compounds. At high concentrations, its heat resistance drops to approx. 900 ℃. Lower temperatures also apply to work in reducing gases environment, or in the case of sediments.

The related and at the same time with similar chemical composition species with lower resistance to oxidation is the grade H20N12S2, 1.4828, AISI 309, X15CrNiSi20-12 - heat resistant steel up to approx. 950-1000 ℃.

The chip and plastic processing of the above-mentioned grades is somewhat difficult due to the high ductility. The properties of durability at high temperatures give way to H18N10MT steels, which unfortunately do not show comparable resistance to oxidation.

Material H25N20S2 and the equivalent of X15CrNiSi25-21 / 1.4841 is used in the manufacture of parts for devices for pyrolysis of gases, methane conversions, transporters in furnaces, as well as in the production of porcelain baskets, the ends of pipes for blowing glass, hydrogenation, and parts exposed to high loads at work in high temperatures like hooks, conveyors in the glass, metallurgical or chemical industry - petrochemical.

The steel can be arc welded, gas-welded or welded with resistance welding using ES-24-18, or Sp12. wire.


General mechanical properties X15CrNiSi25-21 / 1.4841 +AT

  • Tensile strength, Rm: 550 - 750 MPa
  • The yield point, Re: > 230 MPa
  • Elongation, A > 28%
  • Hardness: < 223 HB
  • The specific heat at 20 ℃ = 0.12 cal/g ℃
  • Thermal capacity, cp20-100℃ = 500 J ⋅ kg-1 ⋅ K-1
  • Thermal conductivity, λ = 14,7 W ⋅ m-1 K-1
  • Linear expansion coefficient α = 15,0 ⋅ 10-6 K-1

 


Thermal conductivity:

  • 0 ÷ 100℃ ... 0.031 cal/cm sec. ℃
  • 0 ÷ 500℃ ... 0.041 cal/cm sec. ℃

 


Coefficient of linear expansion depending on the temperature range

  • 20 ÷ 100℃ ... 15.2 ⋅ 10-6
  • 20 ÷ 500℃ ... 17.0 ⋅ 10-6
  • 20 ÷ 800℃ ... 18.0 ⋅ 10-6
  • 20 ÷ 1000℃ ... 19.0 ⋅ 10-6
  • 20 ÷ 1200℃ ... 19.5 ⋅ 10-6

 


Electrical resistance

  • 20℃ ... 0,90 om mm2/m
  • 1000℃ ... 1,25 om mm2/m

 


Creeping limit and creep resistance

Temperature Creep strength Creep limit
Rz/1000 (MPa) Rz/10000 (MPa) Rz/100000 (MPa) R1/1000 (MPa) R1/10000 (MPa)
600℃ 170 130 80 105 95
700℃ 90 40 18 50 35
800℃ 40 20 7 23 10
900℃ 20 10 3 10 4
1000℃ 5 - - 3 -

 


Heat treatment of 1.4841, AISI 310/314

Supersaturation at 1100 - 1150 ℃ with cooling in water, or with small elements with a thickness of 2 mm in air.


The company in the above-mentioned grades supplies:

 


Other replacements and equivalents:

X15CrNiSi25-21, X15CrNiSi2521, X 15 CrNiSi 25-21, X15CrNiSi25-20, X 15 CrNiSi 25-20, X15CrNiSi2520, 1.4841, 4841, 20Х25Н20С2, 20Ch25N20S2, 20Kh25N20S2, AISI 310, AISI 314, SUH 310, X22CrNi2520, 310S24, 310 S 24, Z12CNS25.20, C.4578, 15SiNiCr250, H10, Ch25N20S2, CSN 17255, H16, STS 310, 310S, IASC4841, J-310, 314S25, 314 S 25, Z15CNS25-20, Z 15 CNS 25-20, Z10CNS25-20, Z 10 CNS 25-20, 20Cr25Ni20, 2Cr25Ni20, 16Cr25Ni20Si2, V-310, RA 310, J94202, J94211, J94302, S31000, S31400, SAE 30310, TP 310, Type 310, SS 310, F 310.


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