The UGI® 4313 +A

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Description

The UGI® 4313 grade is a low-carbon nickel-alloyed martensitic stainless steel which combines high mechanical properties, good impact strength and a corrosion resistance superior to that of conventional martensitic stainless steel grades with a high C content. It can be used between -60°C and +300°C.

In the heat-treated condition (quenching + tempering), the microstructure of UGI® 4313 consists of tempered martensite. It may possibly contain traces of ferrite and residual austenite. Depending on the tempering temperature chosen, UGI® 4313 may contain up to about 15% of residual austenite.


UGI® 4313 is ferromagnetic (it attracts the magnet), irrespective of its metallurgical condition. However, its magnetic properties (permeability, coercive force, remanence and polarization at saturation) depend on the conditions of heat treatment. It is a good candidate for applications where a compromise between mechanical strength, corrosion resistance and magnetism is required, for example for fuel injectors in the automotive sector. For more information, please consult with the supplier

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

7.7 g/cm³

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Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

200 GPa

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100.0 °C

195 GPa

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200.0 °C

185 GPa

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300.0 °C

170 - 175 GPa

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Tensile strength

23.0 °C

1100 MPa

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max., diameter ≤ 160mm

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.05E-5 1/K

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for 20 to mentioned temperature

200.0 °C

1.09E-5 1/K

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for 20 to mentioned temperature

300.0 °C

1.13E-5 1/K

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for 20 to mentioned temperature

400.0 °C

1.16E-5 1/K

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for 20 to mentioned temperature

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Specific heat capacity

23.0 °C

430 J/(kg·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

23.0 °C

6E-7 Ω·m

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Chemical properties

PropertyValueComment

Carbon

0.05 %

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max.

Chromium

12 - 14 %

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Iron

Balance

Manganese

1.5 %

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max.

Molybdenum

0.3 - 0.7 %

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Nickel

3.5 - 4.5 %

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Nitrogen

0.02 %

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max.

Phosphorus

0.04 %

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max.

Silicon

0.7 %

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max.

Sulfur

0.015 %

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max.

Technological properties

Property
Application areas

UGI® 4313 is intended for the following applications (non-exhaustive list):

  • Couplings, pumps, valves and compressors for chemical and petrochemical industries;
  • Aerospace, automotive and engine applications (especially injection);
  • Parts for power generation turbines;
  • Medical instrumentation;
  • Building, structures;
  • Military and defence applications.

  • Cold Forming

    Wire drawing – Shaping: UGI® 4313 is suitable for cold working by conventional methods.

    Corrosion properties

    Localized pitting corrosion: The resistance to localized pitting corrosion largely depends on the composition of the grade; calculation of the PREN pitting index (=%Cr + 3.3x%Mo +16x%N) gives us an indication of the pitting corrosion resistance. With a calculated average PREN of 15, UGI® 4313 has a better corrosion resistance than that of the AISI 420 series (1.4034; average calculated PREN of 13.5); but it remains less satisfactory than that of the AISI 431 series (1.4057; average calculated PREN of 17).


    The pitting corrosion resistance of UGI® 4313 is therefore satisfactory in moderately aggressive environments, i.e. containing less than 100 ppm of chloride ions. It is improved with a surface condition having low roughness, obtained for example by electropolishing.

    General machinability

    UGI® 4313 can be machined both in annealed condition (A) and in quenched and tempered conditions (QT). The annealed condition, due to its low mechanical properties, is more subject to chip sticking to the tools, which could accelerate tool wear and adversely affect post-machining surface conditions. The quenched and tempered conditions (QT) cause tool wear that is all the faster when they have high mechanical properties. Accordingly, the QT700 condition has the best machinability of the 4 available conditions.


    The machinability of UGI® 4313 is similar to that of nickel-containing martensitic grade of the UGI® 4418 type. Our technical support department is at your disposal for any requests on the subject.

    Heat Treatment

    Annealing: Annealing between 600°C and 650°C with cooling in air or in furnace, to be performed after martensitic transformation.


    Quenching: Quenching should be performed maintaining a temperature in a range between 900°C and 1150°C followed by cooling in air or in oil.


    Tempering : The choice of the post-quenching tempering temperature depends on the required mechanical properties. The temperatures recommended by EN 10088-3 are:

  • +QT700: double tempering between 650°C and 700°C and between 600°C and 620°C
  • +QT780: single tempering between 550°C and 620°C
  • +QT900: single tempering between 520°C and 580°C

  • Hot forming

    Heating to between 1150°C and 1200°C is recommended. Hot working (forging) of UGI® 4313 should preferably be performed in the temperature range between 1200°C and 900°C and be followed by air cooling. The behaviour of the UGI® 4313 grade during forging is similar to that of a 1.4301 type austenitic grade.


    After hot working, a complete heat treatment, consisting of austenitizing and quenching and then tempering, is recommended.

    Other

    Available products:


    ProductShapeFinishToleranceDimensions (mm)
    Descaled rolled barsRound12 to 1322 to 115
    Bars cold-worked by drawing, turning and grindingRound6 to 112 to 115
    Wire rodRoundPickled5 to 32


    Other options: contact the supplier

    Welding

    UGI® 4313 can be welded by arc welding processes (GMAW, GTAW, SMAW, etc.) and by most other processes (spot, seam, laser, etc.). Thanks to its low carbon content and the nickel that it contains, UGI® 4313 is easier to weld than most martensitic stainless steels.


    The martensite, poor in carbon, combined with the finely dispersed residual austenite, confers on the heat affected zones (HAZ) of UGI® 4313 good impact strength in the as-welded condition. UGI® 4313 is therefore relatively insensitive to cold cracking and preheating of the parts is normally not required, unless you have to weld very thick parts or parts having a shape that could engender high post-cooling weld stress concentrations (in such cases, preheating is recommended between 100°C and 200°C).


    For welding with a filler, if the Weld Metal (WM) does not require mechanical properties on a par with those of UGI® 4313, it is possible to use as filler wire an austenitic grade such as UGIWELDTM 316LM. In that case a post-welding heat treatment is generally not necessary.


    If the WM has to ensure mechanical properties identical to those of UGI® 4313, a homogeneous filler wire can be used. In that case, a post-welding tempering heat treatment at 540-580°C is recommended. In MIG welding with homogeneous filler wire, choose a relatively non-oxidizing protective gas such as Ar + 1-2% CO₂ to avoid an excessively high rate of oxygen in the WM, thus ensuring good impact strength for these WMs.