17YRS
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

Heat-treatment Information
K340ESR
K340ESR(精鍊級)

Properties

Cold work tool steel with excellent air hardening properties, good dimensional stability, good toughness, high compression strength and wear resistance.

Very good retention of hardness, excellent electrical discharge machining properties.

Excellent bath, gas, plasma nitriding and PVD-coating properties.

Good vacuum hardening properties. Through the chemical composition uniform distribution and smaller carbide size than high chromium steels.

Better toughness and electric discharge mach inability.

Application

Cutting tools (dies and punches), blanking and punching tools
Cold forming tools
e.g. drawing, deep drawing and extrusion tools, coining tools, thread rolling dies
Shear blades
Measuring tools
Woodworking tools
Advantages

High retention of hardness (higher than 1.2379) also at long times, very good suitable for surface treatment, e.g. bath, gas nitriding and PVD-coating
High toughness up to 45J, approx. 3x higher than 1.2379 (dependent upop hardening and tempering temperatures)
High compression strength(0.2%-compressive strength) over up to 3000N/mm 2 (corresponding 1.2379)
High dimensional stability -0.15/+0.15%
Good wear resistance, especially when subjected to combined adhesive and abrasive friction
Very good electrical discharge machining properties
Arithmetical average roughness 20 to 30% lower than high carbon, high chromium(12%) steel.

Specification

HRC: 56-62

Heat treatment information

Heat treatment

Hot forming 
Forging

1050 to 850°C  
Slow cooling in furnace or thermo insulating material. 

Annealing

800 to 850°C  
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air. 
Hardness after annealing max. 250HB

Stress relieving

approx. 650°C 
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. 
After through heating, hold in neutral atmosphere for 1-2 hours.

Hardening

1040 to 1080°C 
Oil, salt bath, compressed air, air 
After through soaking, hold for 15 to 30 minutes.  
Obtainable hardness:61~63 HRC
 

Tempering

Slow heating 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.

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