420FM|1.2085

Category

Stainless steel
Delivery condition

Hot rolled&forged
Supply form

Flat bar, Square bar, Plate/Block, Round bar

Introduction:

1.2085 is a stainless mold steel similar to 1.2083 but with sulfur added (-0.O5-0.10%), which significantly improves machinability.It maintainsgood corrosion resistance and reasonable hardness(typically 30-36 HRc in pre-hardened condition), While it does not reach the samepolishability level as 1.2083 due to sulfur inclusions,it is a cost-effective solution for medium-grade stainless mold applications wheremachining speed and corrosion resistance are both required.

Chemical composition:

Corresponding international common brands				Hardness	Chemical Composition (%)
CHINA	US	JAPAN	GERMNAY	Hardness	C	Si	Mn	P	S	Cr	Ni	Mo	V
3Cr16NIMOVS	420+S	ROYALLOY	1.2085	HRC:30-36	0.38	0.3	0.8	-	-	15	-	-	-

Characteristics:

Pre-hardened stainless mold steel (~30-36 HRC).
Good corrosion resistance.
Sulfur alloyed excellent machinability.
Moderate polishability (not as high as 1.2083).
Moderate polishability (not as high as1.2083).

Applications:

Medium-quality plastic injection molds exposed to corrosive environments.
Mold parts where faster machining is important.
Components in the packaging and household appliance industries.
General molds with moderate polish requirements.

Properties of Steel 1.2085

Modulus of Elasticity	Density	Thermal Conductivity	Electrical Resistivity	Specific Heat Capacity	Magnetisable
212 × 10³ N/mm²	7.65 g/cm³	18 W/m·K	0.65 Ω·mm²/m	460 J/kg·K (≈0.46 J/g·K)	Yes

Heat Treatment & Processes

01
Hardening

Heat the steel evenly to 820–840°C until the whole section reaches temperature. Then quench in oil to cool.
02
Normalizing

Heat the steel uniformly to about 900°C to achieve a normalized structure.
03
Annealing

Heat P20 steel to 770–790°C, hold it well at temperature, and then let it cool slowly inside the furnace.
04
Tempering

Heat the steel evenly and hold it for at least 1 hour per 25 mm of thickness at the chosen tempering temperature. Allow it to cool in still air.