1.2099 - AT A GLANCE
What kind of steel is the 1.2099?
Steel grade 1.2099 (~X5CrS12) a pre-hardened, corrosion resistant plastic mold steel is magnetic in its annealed and hardened condition, showing improved machinability and corrosion resistance compared to 1.2085. It is noted for its high dimensional stability and consistent hardness in all cross sections as well as its good compressive strength, heat conductivity and weldability. Further heat treatment for this tool steel is not intended.
Properties
1.2099 steel is a good choice for plastic molds and offers an excellent combination of corrosion resistance, wear resistance, dimensional stability and machinability. Its properties give this steel a long service life, a high surface quality and make it low-maintenance.
Practically, this means:
- Uniform strength
- For environments with high humidity
- Good weldability
- Is magneti
- Is low-distortion
- Not suitable for nitriding and eroding
- Working hardness of 33 HRC in delivery condition
- The corrosion resistant steel 1.2099 has better machinability and toughness compared to the 1.2085
Applications
- Mechanical engineering
- Apparatus engineering
- Plastic processing
- Injection tools
- Base plates
- Assembling parts
- Moulding frames
- Plastic moulds
- Extrusion tools
- Valves
- Steam vales
- Water valves
- Fittings parts
- Pump construction
- Pump rods
- Compressor Construction
- Compressor parts
- Surgical instruments
- Corrosion restistant tools
- Base components
- Hot runner systems
- For processing aggresive plastics
- For processing in humid conditions
- Support panels
1.2099 Standard values
Chemical composition (+additives):
| C | Si | Mn | S | Cr | Ni |
|---|---|---|---|---|---|
| 0.05 - 0.05 | 0.2 - 0.3 | 0.9 - 1 | 0.12 - 0.12 | 12.5 - 12.5 | 0.4 - 0.45 |
Chemical designation:
~X5CrS12
Working hardness:
approx. 33 HRC (reference value for delivery condition)
Delivery condition:
max. 330 HB
1.2099 Physical properties
What group of steel does the 1.2099 belong to?
- Martensitic tool steel
- Plastic mould steel
- Stainless steel, corrosion resistant
Is the 1.2099 a stainless steel?
To be classified as a stainless steel the material has to have a minimum mass fraction of 10,5 % of chromium. This means that the 1.2099 is a stainless steel with a mass fraction of 12,5 % of chromium.
Is the 1.2099 corrosion resistant?
With a mass fraction of 12,5 % of chromium the 1.2099 is corrosion resistant.
1.2099 General corrosion resistance
As a corrosion-resistant mould steel, the 1.2099 can be used for processing aggressive plastics, in humid conditions and in buildings with condensation.
Is the 1.2099 magnetisable?
As a martensitic stainless steel, 1.2099 has a ferromagnetic crystal structure, which makes it magnetisable. It can be clamped onto magnetic plates for sawing or milling, for example.
1.2099 Technical properties
1.2099 Working hardness
The working hardness for tool steel 1.2099 is at approx. 33 HRC on delivery.
1.2099 Density
The density for tool steel 1.2099 at a temperature of 20 °C is 7.7 g/cm³.
1.2099 Tensile strength
The tensile strength for tool steel 1.2099 is approx. 1125 N/mm². This value is the result of a tensile test, which shows how much force is required before the material begins to stretch or elongate before it breaks.
1.2099 Wear resistance
On a scale where 1 is low and 6 is high the 1.2099 receives a 2 for its wear resistance.
1.2099 Machinability
The 1.2099 receives a 2 for its machinability on a scale where 1 is low and 6 is high.
1.2099 Heat conductivity
At room temperature the 1.2099 has a heat conductivity of 23,9 W/(m*K).
1.2099 Thermal expansion coefficient
The following table shows the expansion or contraction at different temperatures, which can be very important for work at high temperatures or with significant temperature fluctuations.
Medium thermal expansion coefficient
Value 10-6m/(m*K)
At a temeprature of
10.25
20 – 100 °C
10.72
20 – 200 °C
11.14
20 – 300 °C
11.58
20 – 400 °C
12.02
20 – 500 °C
1.2099 Specific heat capacity
The specific heat capacity of the 1.2099 at room temperature is 0.46 J/kg*K. This value indicates how much heat is required to heat a certain amount of material by 1 Kelvin.
1.2099 Specific electrical resistance
The following table shows the specific electrical resistance of 1.2099.
Table of the specific electrical resistivity
Value (Ohm*mm2)/m
At a temperature of
0.65
20 °C
ROUND STEEL – IN BLACK!
1.2099 Procedure
1.2099 Heat treatment
Plastic mould steel 1.2099 is delivered in a tempered condition and can be used as supplied. Further heat treatment is therefore not required.
If heat treatment from 1.2099 to a higher hardness is necessary, please refer to the section on ‘Hardening’ below. However, a higher hardness reduces the toughness and hardenability of this steel grade.
1.2099 Annealing
Protect the 1.2099 and heat it evenly to a temperature of 850 – 880 °C, then cool it down in the oven.
1.2099 Stress relieving
Heat the material evenly to 480 °C and hold it for 2 hours, then cool the 1.2099 in the furnace or in sand.
1.2099 Tempering
Temper the material 1.2099 twice for at least 2 hours immediately after hardening.
1.2099 Hardening
As a rule, no further heat treatment is required for this material. If further or renewed tempering of 1.2099 mould steel is required, the steel should be soft annealed before hardening.
Then heat the parts evenly to a temperature of 1050°C and hold them there for half an hour. To prevent decarburisation and oxidation, the material should be protected during the hardening process.
1.2099 Quenching
When quenching 1.2099 in oil, care must be taken to ensure that the cooling rate is not so fast as to distort or crack the material. Once the material has cooled to 50–70 °C, it should then be tempered.
Oil
1.2099 Surface treatment
Polishing can be a type of surface treatment that increases corrosion resistance, as well as providing an aesthetic effect.
1.2099 Processing
1.2099 Forging
Material 1.2099 can be welded without preheating or post-treatment. The welding consumables should be similar to the chemical composition and mechanical properties of the base material. No excessive heat-affected zones form around the weld metal. This avoids the risk of weld-related cracks during repairs or later operation. For large weld repairs, it is recommended to reduce internal stresses by stress relieving the parts at a maximum temperature of 480°C.
