*mydirectindustry

Catalogs
NACHI America
DURO for hot work

DURO for hot work

Product catalog summary

Overview of DURO for Hot Work
DURO series, developed by NACHI, are special steels designed for precise die and mold applications. These steels are characterized by high toughness and strength, achieved through NACHI's proprietary steel manufacturing and refining technology. The DURO series minimizes non-metallic inclusions and segregation, enhancing performance by controlling carbide quantity and size.

Grades and Applications
The DURO series includes two main grades for hot work: DURO-N1 (High Toughness Grade) and DURO-F1 (High Strength Grade). Each grade offers a unique balance of toughness and wear resistance, suitable for various applications such as die and punch for hot work.

Mechanical Properties
DURO-N1 and DURO-F1 exhibit superior impact resistance and tensile strength at high temperatures compared to conventional hot work tool steels like H13. DURO-N1 shows higher impact resistance from room temperature to 600°C, while both DURO-N1 and F1 maintain higher tensile strength up to 700°C.

Wear and Heat Check Resistance
Both DURO-N1 and F1 demonstrate excellent wear resistance and heat check resistance, outperforming H13 in tests. These properties make them ideal for applications requiring durability under high thermal and mechanical stress.

Heat Treatment Recommendations
DURO grades require specific heat treatment conditions to achieve desired hardness levels. DURO-N1 is typically used within an HRC range of 50-54, while DURO-F1 is used within HRC 54-60. The heat treatment process involves precise control of austenitizing and tempering temperatures.

Applications and Performance
DURO steels are used in various applications, including hub forming, forging, and punching, offering significantly longer life compared to traditional steels like H10 and H13. For instance, DURO-F1 can extend the life of forging punches up to four times longer than H10.

Conclusion
The DURO series provides a robust solution for hot work applications, combining high toughness, strength, and resistance to wear and heat checks. These properties ensure enhanced performance and longevity in demanding industrial environments.

Catalog excerpts

Special Steels for Precise Die and Mold High Toughness Grade ■■mmaflil High Strength Grade ■■iu:i«aal

Open the catalog to page 1

DURO-Created by NACHI’s original technology Steels with high toughness and strength for precise die and mold • DURO series, special steels for precise die and mold, are high quality and high grade materials which are made by NACHI’s original technology of steel manufacturing and refining. • They have less non-metallic inclusion and segregation that may cause fractures, and shows superior performance because of the best control for carbide quantity and size. Properties of DURO for Hot Work Good •DURO for Hot Work has two type grades, High Toughness Grade is DURO-N1, High Strength Grade is DURO-F1....

Open the catalog to page 2

FM ALLOY is DURO is a brand name for NACHI’s newest material products. Made from NACHI’s own technology to be high performance alloys with fine microstructure control. named from the Latin word which means “hard” or “endure”. A description for our tough materials to be used for die and mold. Benefits of DURO • DURO is made by a highly purified procedure, to have high toughness and fatigue strength because of very little non-metallic inclusions. • Quantity and size of carbides in DURO microstructure are controlled to have a superior balance of toughness and wear resistance. Classification Grade...

Open the catalog to page 3

Features of DURO Series for Hot Work Mechanical Properties Superior impact resistance in high temperature impact resistance than H13 in (Warm working zone). Excellent tensile strength in high temperature tensile strength than H13 in

Open the catalog to page 4

Superior wear resistance OGOSHI's test wear resistance than H13. Great heat check resistance DUR0-N1, F1 have high strength in high temperature and show great heat check Heat check test • Heating ,7S90£\ ~* Water cooling 4sec ~* Air cooling 2sec

Open the catalog to page 5

Features of DURO Series for Hot Work Heat treatment of DURO for Hot Work Heat treatment condition Grade Requirement Aus. [˚C (˚F)] Temp. [˚C (˚F)] Hardness (HRC) For toughness 1030 (1886) 620 × 2 (1148) 50.5 Standard 1050 (1922) 600 × 2 (1112) 52.0 For strength in high temperature 1070 (1958) 580 × 2 (1076) 53.5 For toughness 1080 (1976) 600 × 2 (1112) 54.5 Standard 1100 (2012) 580 × 2 (1076) 56.0 For strength in high temperature 1140 (2084) 580 × 2 (1076) 57.5 DURO-N1 DURO-F1 *Thickness of sample: 50 mm, vacuum furnace + pressure gas quenching (about 4 bar) *Hardness may vary depending on material...

Open the catalog to page 6

Quenched and tempered hardness chart For special applications it can also be salt bath furnace. Sample choices of steel grade for applications

Open the catalog to page 7

NACHI-FUJIKOSHI CORP. E-mail: webmaster @ nach i-f uj i kosh i .co.jp Tokyo Head Office : Shiodome Sumitomo Bldg. 17F 1-9-2 Higashi-shinbashi, Minato-ku, Tokyo 105-0021, Japan Toyama Head Office: 1-1-1 Fujikoshi-Honmachi, Toyama 930-8511, Japan Tel: +81 -(0)76-423-5111 Fax: +81 -(0)76-493-5211 Overseas Sales Companies • NACHI AMERICA INC. HEADQUARTERS 17500 Twenty-Three Mile Road, Macomb, Michigan, INDIANA BRANCH 715 Pushville Road, Greenwood, Indiana, 46143, WEST COAST BRANCH 12652 E. Alondra Blvd. Cerritos, California, 90703, MIAMI BRANCH - LATIN AMERICA DIV. ATLANTA OFFICE Six Concourse Parkway,...

Open the catalog to page 8

All NACHI America catalogs and technical brochures

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

Brand list