UGIMA® 4541 Annealed

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Description

The main property of UGIMA® 4541 is its resistance to intergranular corrosion. It uses titanium as a stabilising element to avoid the formation of chromium carbides in the grade when it is used at high temperature. The mechanical properties of this stainless steel are better than those of 1.4307.


UGIMA® 4541 is specifically designed for machining and bar turning and provides increased productivity for these operations.


UGIMA® 4541 has excellent oxidation and corrosion resistance and good creep behaviour. It is particularly recommended for applications requiring heat resistance at continuous or cyclic operating temperatures (400 – 850°C).

Related Standards

Equivalent Materials

This material data has been provided by Ugitech SA.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyTemperatureValue

Density

23.0 °C

7.9 g/cm³

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Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

200 GPa

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100.0 °C

194 GPa

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200.0 °C

186 GPa

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300.0 °C

180 GPa

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400.0 °C

172 GPa

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500.0 °C

165 GPa

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Elongation

23.0 °C

45 %

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min.

Hardness, Brinell

23.0 °C

215 [-]

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max.

Tensile strength

23.0 °C

500 - 700 MPa

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Yield strength Rp0.2

23.0 °C

190 MPa

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min.

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.6E-5 1/K

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for 20 to mentioned temperature

200.0 °C

1.65E-5 1/K

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for 20 to mentioned temperature

300.0 °C

1.7E-5 1/K

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for 20 to mentioned temperature

400.0 °C

1.75E-5 1/K

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for 20 to mentioned temperature

500.0 °C

1.8E-5 1/K

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for 20 to mentioned temperature

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Specific heat capacity

23.0 °C

500 J/(kg·K)

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Thermal conductivity

23.0 °C

15 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

23.0 °C

7.3E-7 Ω·m

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Chemical properties

PropertyValueComment

Carbon

0.08 %

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max.

Chromium

17 - 19 %

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Iron

Balance

Manganese

2 %

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max.

Molybdenum

0.5 %

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max.

Nickel

9 - 12 %

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Phosphorus

0.05 %

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max.

Silicon

1 %

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max.

Sulfur

0.03 %

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max.

Titanium

0.7 %

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max., min: 5x(C+N)

Technological properties

Property
Application areas

  • Automotive: turbochargers, exhaust manifolds, sensor supports.
  • Aeronautics: turboprop engines, jet engines.
  • Process, chemical and oil industry: fittings and expansion joints, components for high-temperature equipment, furnaces, heat exchangers.

  • Corrosion properties

    It has excellent corrosion resistance in natural environments (drinkable water, rural and urban environments) and in food processing and agri-food environments (but with reservations in some specific cases, such as white wines, mustards, etc.).


    UGIMA® 4541 is resistant to intergranular corrosion even after welding; it complies with the ASTM A262 Practice E standardised test.


    UGIMA® 4541 can be used in mineral and organic acids, for example nitric acid. Precautionary measures are however required when it is used in other acids, for example phosphoric and sulphuric acids.


    UGIMA® 4541 can be salt spray tested (ISO 9227 standardised test). It is difficult for us to give an accurate value in terms of the number of hours after which traces of corrosion will appear, because such resistance to salt spray depends not only on the composition of the grade, but also on the geometry of the component tested, the surface finish (roughness, machining scratches), the presence or absence of pollution (iron particles, cutting oils, etc). Finished components can be tested in the laboratory.


    UGIMA® 4541 has excellent high-temperature chemical resistance; estimated continuous use limit temperatures are given below (the limit temperature must take into account the exact nature of the atmosphere and the amplitude and frequency of mechanical and thermal stresses):


    Oxidizing atmosphere850°C
    Oxidizing sulphur atmosphere750°C

    General machinability

    Turning: Not only does UGIMA® 4541 reduce tool wear (see the graph on the right for improvements in terms of potential turning productivity), it also provides better chip breakability (see graph on the right for the number of cutting conditions with fragmented chips in turning).


    Bar turning: To compare UGIMA® 4541 with a standard 1.4541, tests were carried out on a TORNOS SIGMA 32 screw machine. For each grade, the test consisted in defining the optimum cutting conditions for making, for example, 1000 components without having to change tools. The table below shows the cutting conditions that can produce 1000 components without having to change tools for each grade according to the operations and tools used. Improved productivity that can exceed 10% was noted.


    OperationsToolsUGI 4541UGIMA® 4541
    ´Rough straight turningSECO TM2000
    CCMT 09T308-F2
    Vc = 170 m/min
    ap = 2 mm; f = 0.30 mm/rev
    Vc = 190 m/min
    ap = 2 mm; f = 0.30 mm/rev
    Finish straight turningSECO TM2000
    CCMT 09T304-F1
    Vc = 240 m/min
    ap = 0.5 mm; f = 0.10 mm/rev
    Vc = 250 m/min
    ap = 0.5 mm; f = 0.10 mm/rev
    Axial drillingGÜHRING RT100F
    6 mm – DK460UF
    Vc = 70 m/min
    f = 0.10 mm/rev
    Vc = 80 m/min
    f = 0.10 mm/rev
    ISCAR IC908
    9.9 mm – ICM099
    Vc = 120 m/min
    f = 0.15 mm/rev
    Vc = 130 m/min
    f = 0.15 mm/rev
    Cross-cuttingSANDVIK 2135
    N132E2-0300-0002-CM
    Vc = 60 m/min
    f = 0.06/0.03 mm/rev
    Vc = 60 m/min
    f = 0.06/0.03 mm/rev

    Heat Treatment

    Annealing: UGIMA® 4541 heat treatment involves maintaining a high temperature of between 1000°C and 1100°C, followed by air- or water-cooling. This treatment, which is called annealing, removes all trace of hardening, while giving the steel its lowest level of mechanical properties.

    Hot forming

    UGIMA® 4541 can be forged at between 950°C and 1250°C without taking special precautions. As for all austenitic stainless steel grades, the force required to deform metals is high (far higher than that required for carbon steels). Components can be air- or water-cooled.

    Other

    Available products:


    ProductShapeToleranceDimensions (mm)
    Rolled and descaled barsRound12 to 1322 to 130
    Cold-finished drawn, turned, ground barsRound6 to 112 to 130
    Drawn barsHexagonal113 to 60


    Other options: contact the supplier

    Surface Treatment

    The conditions generally used for austenitic grades apply to UGIMA® 4541.

    Welding

    UGIMA® 4541 can be welded by all types of arc processes (MIG, TIG with or without filler metal, coated electrodes, submerged arc welding, etc.), resistance (spot or seam), friction, electron beam or LASER welding.


    Thanks to the correct analytical balance and despite a slightly higher percentage of S than UGI 4541, there is no increased risk of thermal cracking for UGIMA® 4541 during arc and LASER welding.


    In MIG welding, the Ar (+ possibly He) based shielding gas will have to contain 2 to 3% CO₂ or O₂ to make it easier to stabilise the welding arc; in TIG welding, the filler gas will be pure Ar (+ possibly He). H₂ and N₂ can be added to the shielding gas if required.


    If filler metal is used, ER347 wire should be preferred, particularly in the case of welds used at high temperatures.