W303ESR-Properties & Application-WU JII INDUSTRY CO., LTD.-EZB2B taiwan machine tools ＆ autoparts ＆ plastic mold die

20YRS

WU JII INDUSTRY CO., LTD.

886-4-23593510

886-4-23593529

No. 1, 20th Rd., Industrial Park, Taichung City, Taiwan

www.wujii.com.tw

Products

Properties & Application

W303ESR

Properties

Hot work tool steel featuring excellent hot tensile properties, high retention of hardness, good toughness and resistance to heat checking.

Application

Heavy duty hot work tools and dies, mainly for light alloy processing, mandrels, dies, and containers for metal tube and rod extrusion; hot extrusion equipment; tools and dies for the manufacture of hollow bodies, screws, rivets, nuts and bolts.

Die casting equipment, forming dies, die inserts hot shear blades, and plastic moulding dies.

Specification

Heat treatment information

Heat treatment
Stress relieving	600 to 650°C/ Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After thorough heating, hold in neutral atmosphere for 1-2 hours.
Hardening	1030 to 1080°C Oil, salt bath(500-550°C), air Holding time after temperature equalization: 15 to 30 minutes. Obtainable hardness: 52-56 HRC in oil or salt bath, 50-54 HRC in air.
Tempering	Slow cooling to tempering temperature immediately after hardening/ time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air. It is recommended to temper at least twice. A third tempering cycle for the purpose of stress relieving may be advantageous stress relieving may be advantageous 1 st tempering approx. 30°C above maximum secondary hardness. 2 nd tempering to desired working hardness The tempering chart shows average tempered hardness values. 3 rd for stress relieving at a temperature 30-50°C below highest tempering temperature.