VP420IM Steel

VP420IM Steel

Steel name: VP420IM
Diagram No.: 1790
Mat.No. (Wr.Nr.) designation: 1.2083
DIN designation: X42Cr13
AISI/SAE designation: 420
Chemical composition in weight %: 0.40% C, 0.80% Si, max. 1.00% Mn, 13.50% Cr, 0.25% V
Steel group: Plastic mould steels
Properties: No data
Applications: Moulds for Injection or extrusion of chlorinated thermoplastic polymers, such as PVC. Moulds that work or are storage in corrosion environments or wet conditions. Moulds for glass industry. Other applications were high mechanical strength and high corrosion resistance are necessary.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Pre-heating: 400 - 450 ºC. Hardening: 1000 - 1040 ºC (usually 1025). After preheating, moulds must be slow heated (300 ºC/h max.) to hardening temperature, holding 30 min after soaking (i. e. after mould is fully heated throughout). Surface decarburization cause decrease in hardness and may cause polishing problems named “overpolishing”. Therefore, the use of protective atmosphere (or vacuum) is important during heating to hardening. Quenching may be done in oil, holding until reaching 80 ºC. Then, it is recommended that moulds are carried to another furnace at 100/150 ºC in order to equalise temperature (in this step 1h for each 100 mm is required). Immediately after this treatment, heating to tempering should start.
Tempering: 175 – 550 ºC. For providing maximum corrosion resistance, tempering temperatures should be between 200-300 ºC (see diagram on the right), for hardness between 48-54 HRC. Tempering temperatures should be suitable to the required hardness (see diagram). Double tempering is required and after each one moulds must cool down to room temperature. For each tempering treatments, the holding time of at least 2 h (after soaking) is necessary. As discussed before, tempering between 200 - 300 ºC is recommended to improve corrosion resistance.

Tempering Diagram

Price: 20.00 US $
Buy Online Tempering Diagram

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