UGI® 4116N Annealed

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The high carbon and nitrogen content of UGI® 4116N leads to a very attractive corrosion resistance versus hardness properties. It can replace grades 1.4112 / 1.4125 (AISI 440B and 440C) in many applications.

Processing similar to type 1.4034 (AISI 420) stainless steel, therefore much easier than 1.4112 / 1.4125 (AISI 440B and 440C)

Recommended applications: pins, shafts, nozzles, wear resistant parts, etc. as a replacement of 1.4112/1.4125 or AISI 440B / 440C.

Possible mechanical properties after treatment on parts:

The following Table summarizes the mechanical properties at room temperature which may be obtained after heat treatment on parts:

ConditionHardnessImpact Values KCV
Air Cooled from 1050°C + Tempered 200°C/1h57.56.7 J/cm²
Air Cooled from 1050°C + Cryogenic Cooling (-80°C/1h) + Tempering 200°C/1h58.52.3 J/cm²

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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23.0 °C

7.7 g/cm³

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Elastic modulus

23.0 °C

215 GPa

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Hardness, Vickers

23.0 °C

210 [-]

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Coefficient of thermal expansion

300.0 °C

1.12E-5 1/K

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for 20 to mentioned temperature

Thermal conductivity

23.0 °C

30 W/(m·K)

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Electrical resistivity

23.0 °C

6.5E-7 Ω·m

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Chemical properties



0.48 - 0.55 %

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14 - 15 %

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1 %

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0.8 %

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0.05 - 0.15 %

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0.04 %

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1 %

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0.015 %

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0.1 - 0.15 %

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Technological properties

Application areas

Parts (pins, shafts, nozzles…) already made with 4112/4125 or 440B/C…High hardness re-quirements with a rather good corrosion resistance.

Corrosion properties

Nitric AcidMedium
Phosphoric AcidNot recommended
Sulfuric AcidNot recommended
Acetic AcidNot recommended
NaCl (Salt Fog)Not recommended
SeawaterNot recommended

The corrosion behavior of UGI® 4116N is similar to that of grade 1.4021 (AISI 420), far better than that of 1.4112 / 1.4125 (AISI 440B and 440C).

Pitting corrosion: UGI® 4116N performs better than high-carbon martensitic grades such as 1.4109, 1.4112 and 1.4125.

The pitting corrosion resistance is better in the Tempered than in the Annealed condition, a feature that is similar for all high-carbon martensitic grades

General machinability

Machinability: UGI® 4116N can be machined in the annealed condition. The machinability of UGI® 4116N is comparable to that of grade 1.4034 and significantly better than the machinability of grades 1.4112 and 1.4125 (AISI 440B / 440C).

Heat Treatment

Solution annealing: For minimum hardness, grade 4116N should be treated at about 840°C a few hours followed by very slow cooling. The hardness thus obtained lies around 210 HV1kg.

Solution Treatment and Quenching: Oil quench or air cooling should be carried out from a recommended solution temperature of 1050°C.

Tempering: See below the curve that was obtained after a 10 minutes solution annealing treatment at 1050°C fol-lowed by air cooling. Tempering at 200°C achieves a good hardness / toughness balance.

Hot forming

Forming: UGI® 4116N can be readily forged in the 950°C – 1200°C temperature range. Heating between 1180°C and 1200°C prior to forging is recommended, and forging temperatures should not decrease below 950°C. After forging, a slow cooling to room temperature is necessary, followed by annealing treatment, if a minimum hardness is required.


Available products:


Dimension (mm)
hot finished barsroundBlackø 23 - 115
hot rolled descaledK12 et K13ø 22 - 115
hexagonalhot rolled descaledø 22 - 58
cold finished barsroundturned & polishedISO 9 - 10ø 22 - 115
bright drawnISO 9 - 10ø 1.8 - 30
groundISO 6 - 7 - 8 - 9ø 1.5 - 70
hexagonaldrawnø 3.0 - 60
Wire rodroundpickledø 5.5 - 32
Drawn wireroundmattø 1.0 - 14

Other options: contact the supplier


Welding of grade UGI 4116N is only possible with special precautions, and should be avoided whenever possible.