UGI® 4029

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A screw machining grade, UGI® 4029 is a martensitic steel whose machinability is improved by the addition of sulphur. Recommended for machined parts with high mechanical properties, it will be used in relatively unaggressive environments (oils, greases, cold detergents, etc.).

Related Standards

Equivalent Materials

This material data has been provided by Ugitech SA.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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.

Ashby charts


Chemical properties



0.28 %

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12.8 %

Show Supplier Material materials with Chromium of 12.8 %


0.2 %

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Technological properties

Application areas

Mechanical engineering, transport, food and food processing industry, defence, oil and petrochemicals industry, electronic equipment. Machined parts, screw machining.

Corrosion properties

Corrosion resistance is adversely affected by a high sulphur content compared with martensitic stainless steels with 13% Cr (such as 4021), particularly in environments conducive to pitting or crevice corrosion.

Heat Treatment

Tempering curves on the rigth side of the material page.

Tempering temperature: Indicative mechanical properties after quenching in oil at 950°C and tempering for 2 hours.


Available products:


RoundRolled and descaled bars12 to 1322 to 15 mm
RoundTurned and polished9 to 1122 to 115 mm
RoundDrawn bar8 to 93 to 55 mm
RoundGround bar6 to 93 to 80 mm
HexagonalDrawn bar113 to 55 mm
Wire rodRoundPickled5.0 to 32 mm
Drawn wireRound16.0 to 1.0 mm

Other products: contact the supplier