CORRAX UDDEHOLM CORRAX

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1 UDDEHOLM

2 REFERENCE STANDARD AISI WNr. JIS ASSAB DF-2 ARNE O1 ( (SKS 3 ASSAB DF-3 O1 ( (SKS 3 ASSAB XW-5 SVERKER 3 D6 (D3 ( (SKD 2 ASSAB XW-10 RIGOR A SKD 12 ASSAB XW-41 SVERKER 21 D SKD 11 ASSAB XW-42 D SKD 11 CARMO CARMO CALMAX CALMAX CALDIE ASSAB 88 CALDIE SLEIPNER ASSAB PM 23 SUPERCLEAN VANADIS 23 SUPERCLEAN (M3: SKH 53 ASSAB PM 30 SUPERCLEAN VANADIS 30 SUPERCLEAN (M3:2 + Co SKH 40 ASSAB PM 60 SUPERCLEAN VANADIS 60 SUPERCLEAN ( VANADIS 4 EXTRA SUPERCLEAN VANADIS 6 SUPERCLEAN VANADIS 10 SUPERCLEAN VANCRON 40 SUPERCLEAN ELMAX SUPERCLEAN VANADIS 4 EXTRA SUPERCLEAN VANADIS 6 SUPERCLEAN VANADIS 10 SUPERCLEAN VANCRON 40 SUPERCLEAN ELMAX SUPERCLEAN ASSAB 518 P ASSAB 618 P20 Mod ASSAB 618 HH P20 Mod ASSAB 618 T P20 Mod Mod. ASSAB 718 SUPREME IMPAX SUPREME P20 Mod ASSAB 718 HH IMPAX HH P20 Mod NIMAX NIMAX MIRRAX 40 MIRRAX Mod. VIDAR 1 ESR VIDAR 1 ESR H SKD 6 UNIMAX UNIMAX ASSAB SUS 420J2 STAVAX ESR STAVAX ESR 420 Mod ESR SUS 420J2 MIRRAX ESR MIRRAX ESR 420 Mod. POLMAX POLMAX RAMAX HH RAMAX HH 420 F Mod. ROYALLOY ROYALLOY PRODAX ASSAB MM40 ALVAR 14 ALVAR SKT 4 ASSAB SKT 4 ASSAB M ORVAR 2M H SKD 61 ASSAB 8407 SUPREME ORVAR SUPREME H13 Premium ESR SKD 61 DIEVAR HOTVAR QRO 90 SUPREME DIEVAR HOTVAR QRO 90 SUPREME ASSAB SNCM8 ASSAB SCM4 ASSAB S50C ASSAB is a trademark of ASSAB Pacific Pte Ltd. The information contained herein is based on our present state of knowledge and is intended to provide general notes on our products and their uses. It should not therefore be construed as a warranty of specific properties of the products described or a warranty for fitness for a particular purpose. Each user of ASSAB products is responsible for making its own determination as to the suitability of ASSAB products and services. Edition D

3 General Compared with conventional corrosion-resistant tool steel, Corrax has the following advantages: Flexible hardness, HRC, achieved by an ageing treatment in the temperature range C Extremely good dimensional stability during ageing, a small shrinkage will occur in all directions but no distortion High uniformity of properties even for large dimensions Very good weldability, no preheating necessary No hard white layer after EDM Corrosion resistance superior to that of AISI 420, WNr and WNr Properties PHYSICAL PROPERTIES Aged to ~46 HRC. Temperature 20 C 200 C 400 C Density kg/m Modulus of elasticity MPa Coefficient of thermal expansion per C from 20 C x x 10-6 Typical analysis % C 0.03 Si 0.3 Mn 0.3 Cr 12.0 Ni 9.2 Mo 1.4 Al 1.6 Thermal conductivity W/m C Standard spec. Delivery condition Colour code None Solution treated to ~34 HRC Black / Grey MECHANICAL PROPERTIES Tensile and compressive strengths Approximate strength at room temperature. Hardness ~34 HRC 1 ~40 HRC 2 ~46 HRC 2 ~58 HRC 2 Rp MPa 1000 MPa 1400 MPa 1600 MPa Applications Injection moulds Corrosive plastics Rubber Medical parts Extrusion dies Plastic processing Screws Parts for the food and packaging industry Engineering parts Rm MPa 1200 MPa 1500 MPa 1700 MPa Rc MPa 1300 MPa 1600 MPa 1800 MPa 1 Solution treated condition 2 Aged condition 3 0.2% proof strength 4 Tensile strength CORROSION RESISTANCE Corrax has a very good corrosion resistance, better than the standard corrosion-resistant grades used for plastic moulding. The corrosion resistance is the same in all heat treated conditions (except after nitriding. Corrosion resistance (~52 HRC (~30 HRC 1 Corrax used for the production of PVC tube. Production of PVC tubes or fittings place a very high demand on the corrorison resistance of the extrusion die. Corrax will withstand attacks from most corrosive plastics and diluted acids. A mould made of Corrax will also have good resistance to humid working and storage conditions. Corrax also shows better resistance to stress corrosion cracking than standard hardenable corrosion-resistant steel grades. 3

4 Heat treatment Corrax is delivered in solution treated condition and can be used in the as-delivered condition. When, however, the steel is to be heat treated to a higher hardness, the following instructions may be helpful. STRESS RELIEVING It is not possible to stress relieve Corrax. Ageing will occur if Corrax is heated up to temperatures normally used for stress relieving. For common tool steels, stress relieving is performed in order to avoid dimensional changes during hardening. As for Corrax, no hardening will be done. Therefore, stress relieving is not required. AGEING Corrax can be used in the as-delivered condition. Higher hardness is obtained by ageing. Recommended temperatures and times to achieve a certain hardness is shown in the graph below. Ageing time means the time at the ageing temperature after the tool is fully heated through. SOLUTION TREATMENT It is possible to solution treat Corrax, if aged, in order to get back to the delivery condition. Solution treatment should be done at 850 C, holding time 30 minutes. Cool in air. Hardness, HRC C 575 C 600 C DIMENSIONAL CHANGE Ageing results in a small and uniform decrease in volume. The following shrinkage can be expected during ageing. Ageing 525 C/2h (~50 HRC 575 C/2h (~46 HRC 600 C/4h (~40 HRC Longitudinal direction Dimensional change % Transverse direction Short transverse direction Ageing time, h Machining recommendations When the ageing time is reached, cool the tool in air to room temperature. Ageing at high temperature gives a better toughness compared with ageing to the same hardness at a lower temperature. The cutting data below are to be considered as guiding values and as starting points for developing your own best practice. Condition: Solution treated condition ~34 HRC Ageing recommendation Ageing temperature/time 525 C/4 h 575 C/4 h 600 C/4 h Hardness HRC HRC HRC * Ageing to HRC is only recommended when toughness is not important. If Corrax is used at temperatures higher than 200 C, the solution treated condition (delivery condition is not recommended because ageing can occur during use. TURNING Cutting data parameters Cutting speed (v c Feed (f mm/r Depth of cut (a p mm Carbide designation ISO High speed steel Turning with carbide Rough turning Fine turning Turning with HSS Fine turning P20 - P40 Coated carbide P10 Coated carbide or cerment - 4

5 DRILLING High speed steel twist drill Drill diameter mm Cutting speed (v c Feed (f mm/r * * * * * The same cutting speed when using coated HSS drill, v c = GRINDING Wheel recommendation Type of grinding Face grinding straight wheel Face grinding segments Cylindrical grinding Internal grinding Profile grinding Delivery condition and aged condition A 46 GV A 36 FV A 60 JV A 60 IV A 120 JV Carbide drill Cutting data parameters Cutting speed (v c Feed (f mm/r Indexable insert Type of drill Solid carbide Brazed carbide Electrical discharge machining Corrax can be EDM d in the same way as ordinary tool steels. The white layer will, however, not be as hard and is therefore more easily removed. 1 Drill with interntal cooling channels and brazed carbide tip 2 Depending on drill diameter MILLING Face and square shoulder milling Cutting data parameters Cutting speed (v c Feed (f z mm/tooth Depth of cut (a p mm Rough milling Milling with carbide Fine milling Welding Preheating is not necessary. When welding Corrax in the delivery condition, intermittent welding is recommended Carbide designation ISO P20 - P40 Coated carbide P10 - P20 Coated carbide or cermet Control the length of the strings, mm maximum, when intermittent welding. End milling Cutting data parameters Solid carbide Type of milling Carbide indexable insert High speed steel In order to obtain an even hardness, it is necessary to carry out a heat treatment after welding. The temperature and time are determined by the required hardness and the filler material. TIG-WELD is recommended to be used as filler material. Cutting speed (v c Feed (f z mm/tooth Carbide designation ISO K10, P40 P20 - P30-1 For coated HSS end mill, v c ~ Depending on radial depth of cut and cutter diameter 5

6 Welding method Preheating temperature TIG Welding can be done at room temp. (Preheating is not necessary Photo-etching Corrax has a very good corrosion resistance and a special process is thus required for chemical photo-etching. Fine patterns with shallow depths <0.04 mm are readily achievable. Filler material TIG-WELD Maximum interpass temperature 1 300ºC Postweld cooling 20-40ºC/h for the first two hours and then freely in air Further information Hardness after welding Heat treatment after welding HRC For further information, i.e., steel selection, heat treatment, application and availability, please contact our ASSAB office nearest to you HRC Age to the desired hardness HRC 600ºC 4 h HRC 575ºC 2 h HRC 525ºC 2 h 1 The temperature of the tool in the weld area immediately before the second and subsequent pass of a multiple pass weld. When exceeded, there is a risk of distortion of the tool or soft zones around the weld. Relative comparison of ASSAB plastic mould steels RESISTANCE TO FAILURE MECHANISMS AND CRITICAL MOULD STEEL PROPERTIES ASSAB grade Plastic deformation Cracking Wear Corrosion Polishability Thermal conductivity Machinability ASSAB 618 ROYALLOY ASSAB 718 HH NIMAX POLMAX MIRRAX ESR STAVAX ESR ASSA 8407 SUPREME UNIMAX ELMAX ASSAB XW-10 6

7 Ningbo ASSAB Tooling Technology (Ningbo Co., Ltd. Tel : Fax: info.ningbo@assab.com Cikarang* PT. ASSAB Steels Indonesia Tel : Fax: / info.cikarang@assab.com MALAYSIA Kuala Lumpur - Head Office ASSAB Steels (Malaysia Sdn. Bhd. Tel : Fax: /55 info.kualalumpur@assab.com Tel : Jiangxi* ASSAB Tooling (Dong Guan Co, Ltd., Jiangxi Branch Tel : Fax : info.jiangxi@assab.com 7

8 Choosing the right steel is of vital importance. ASSAB engineers and metallurgists are always ready to assist you in your choice of the optimum steel grade and the best treatment for each application. ASSAB not only supplies steel products with superior quality, we offer state-of-the-art machining, heat treatment and surface treatment services to enhance steel properties to meet your requirement in the shortest lead time. Using holistic approach as a one-stop solution provider, we are more than just another tool steel supplier. ASSAB and Uddeholm are present on every continent. This ensures you that high-quality tool steels and local support are available wherever you are. Together we secure our position as the world's leading supplier of tooling materials. For more information, please visit