ISOTROP H13 Modified Hot work tool seel for die casting dies

Transcription

1 H13 Modified Hot work tool seel for die casting dies is a hot work tool steel, developed by Industeel to offer a cost efficient alternative to ESR grades in the die casting die industry. is produced through a unique and original solidification process developed by Industeel, ensuring a good structural homogeneity of forged blocks. It exhibits improved properties such as a very It is very well adapted to ensure extended life time of zinc, aluminium or magnesium die casting dies : long production runs, pressure casting, water cooled elements... meets most International technical standards governing die casting applications. was approved by the NADCA die committee in October 214. high level of toughness and high resistance to heat checking. Standard and Technical Specification AISI H11 mod AISI H13 mod Meets requirements of NADCA # grade F Meets requirements of SEP1614 / VDG M82 Meets requirements of CNOMO E N Steelmaking Process Electric Arc Furnace / VAD + unique Industeel solidification process. Although is not produced through ESR / VAR process, it meets very similar properties as ESR/VAR products (toughness, microstructure,...) Chemical Analysis Typical heat analysis of (% weight) Typical Value Guaranteed Value C S P Si Mn Cr Mo V max max / Issue Page / F: / / F:

2 MPa Temperature( C) Elonga on Yield strenght Temperature strenght ( F) Tensile Elonga on (%) Hardness (HRC) Time (h), C 6 C 6 C 575 C 5 C Cleanliness Maximum values of ASTM E45 (A method) A.5 (t & h) B 1.5(t) 1.(h) C.5 (t & h) D 1.5(t) 1.(h) Physical Properties Typical values of Temperature C F Density lbs.in Modulus of Elasticity PSI 29,7.1 6, ,4.1 6 Coefficient of Thermal Expension F -1 from 68 F X 7,.1-6 7,6.1-6 Thermal Conductivitity Btu.in.h -1. F Soundness / UT Guarantee All plates & blocks are 1% UT tested and meet the following standards: Euronorm EN class 4 ASTM A681 S1.1 SEP1921 E/e Mechanical Properties is delivered in soft annealed condition. It has to be hardened after roughing. Typical values of after hardening Hardness HRC Yield Strength (Rp,2) N.mm psi Ultimate Tensile Strength (Rm) N.mm -2 psi Elongation (E) % Reduction of area (z) % Hot Tensile Properties Softening Resistance Temperature ( F) Tensile strenght Yield strenght Elonga on MPa Elonga on (%) Hardness (HRC) C 575 C 6 C 6 C 65 C Temperature( C), Time (h) 4/ Issue Page / F: / / F:

3 7 A non NADCA grade (H13 ESR) ESR) NADCA grade B (H13 11 D / E / F (ESR / non ESR) NADCA grade C / (ESR) NADCA 181 E grade (ft.lb) Joules of forged blocks Thickness 13,4 14, Annealed Microstructure / Banding Segregation meets the structural requirements of the following standards: NADCA # Typical microstructure of in delivery condition (thickness 1 / top / mid thickness) X5 Acceptable (NADCA # ) X5 AS5 / AS6 (NADCA # ) Annealed Microstructure / Banding Segregation Toughness / high impact properties are necessary to minimize the risk of premature die failure. exhibits impact test results very similar to those of ESR grades. Typical Impact Properties Toughness measurement at room temperature on samples prehardened at 45 HRC. Charpy V Notch (*) ft.lb Typical Values (average of 3 specimen) to 21 Requirements NADCA # (Grades E & F) 14 NOTE: (*) through thickness direction at mid thickness of the blocks Statistical Evaluation of Toughness Performed on 3 blocks 12 / 13 / 14 sampling in 18 different locations of each blocks, longitudinal and transverse direction. Over 35 samples were cut and evaluated. (ft.lb) Joules NADCA grade E 181 (ESR) NADCA grade C / D / E / F (ESR / non ESR) NADCA grade B (H13 ESR) NADCA grade A (H13 non ESR) ,4 14,2 Thickness of forged blocks 4/ Issue Page / F: / / F:

4 Thermal Fatiuge Dunker test performed on (45 HRC) versus H13 (51 HRC) by Case Western Reserve University / Cleveland, Ohio Total Crack Area Average Max. Crack Length Total Cracked Area (x1 6 µm 2 ) H13 1 H13 (51HRC) (45HRC) Average Max. Crack Length(1x1µm) H13 1 H13 (51HRC) (45HRC) Thermal Cycles Thermal Cycles Heat Treatment is delivered in a soft annealed condition for easier machining. When machining is completed, can be hardened with a heat treatment procedure including preheating, austenitization, quenching and double tempering. Heat treatment should be done under vacuum or under gas protection to avoid surface oxidation and decarburization. Surface and core temperature (Ts/Tc) should be controlled by thermocouples. Preheating Heating rate should be limited to 4 F/h (22 C/h), measured in the core of cavity. First preheating has to be done at Ts 1 F (62 C) and hold until Ts-Tc < 2 F (11 C) Second preheating has to be done at Ts 3 F (83 C) and hold until Ts-Tc < F ( C) Austenitization After second preheating, austenitization should be rapidly increased up to 1885 F (13 C) and hold 3 mn after Ts-Tc < F ( C). In any case, soaking time shall never exceed 9 mn max after Ts reaches 1885 F (13 C). Quenching Quenching shall be performed in oil or pressurized gas. Pressurized gas should be preferred when quenching complex shapes. Fast cooling has to be applied from austenitization temperature down to 3 F ( C) Cooling rate, measured at the surface of the cavity, must be at least 55 F/min (3 C/min) between austenitization temperature and 99 F (53 C) To limit stresses, a special attention shall be paid at the temperature difference between surface and core. Especially in the temperature range 75/84 F (4/45 C), the temperature difference between surface and core shall not exceed 18 F (1 C). Below 3 F ( C), cavity should be air cooled to 12/18 F (5-8 C) and should then be immediately loaded in a furnace to perform a first tempering. 4/ Issue Page / F: / / F:

5 Temperature ( C) air S ll (3 F) C Time F/h 22 C/h (16 F) 57 C (1 F) 62 C (3 F) 83 C (1885 F) 13 C S ll air S ll air S ll air (12 F) 55 C required If --> 45HRC (113 F) 61 C Tempering A minimum of 2 tempering should be performed on immediately after quenching. First tempering should be done at 16 F (57 C) Second tempering shall be performed at a temperature depending on required temperature (see tempering curve below). For a required hardness of 45HRC, second tempering should be performed at 113 F (61 C) In both cases, tempering temperature should be hold 2 hours minimum or 3mn per of thickness. After tempering pieces should be air cooled to room temperature. When a third tempering is required, it should be done at 12 F (55 C) Hardening Chart C (1885 F) 83 C (3 F) 8 Temperature ( C) 6 62 C (1 F) 57 C (16 F) 61 C (113 F) --> 45HRC If required 55 C (12 F) 4 22 C/h 4 F/h S ll air S ll air S ll air 2 C (3 F) S ll air Time CCT Diagram Tempering Curve Temperature ( F) 8 Ac3 Ac1 5 Temperature ( C) 6 A P Hardness HRC Ms B M Mf HV Time(s) Temperature ( C) 4/ Issue Page / F: / / F:

6 Nitriding Typical properties of nitrided layers depending on processes and parameters. Process Gas Nitriding Plasma Nitriding Temperature ( F) 97 F 97 F Time (h) 5 Depth Compound Layer ( m) [4;6] [11;16] Hardness (HV1) [172;19] [129;191] [145;165] Machining In soft annealed condition. Milling (with carbide) : 16 HB [459;59] Feed (fz) /tooth [.79;.7] [.79;.7] [P2;P4] [59;721] [;.79] [.39;.79] P1 Cement Turning (with carbide) : 16 HB [459;565] Feed (fz) /rev [.79;.7] [.79;.7] [P2;P3] [656;82] [;2.39] [.2;.79] P1 Mixed Cement Machining In hardened condition. Milling (with carbide) : [148;295] Feed (fz) /tooth [.79;.7] [.79;.7] [P2;P4] HRC [295;459] [;.79] [.39;.79] P1 Cement Turning (with carbide) : [1;197] Feed (fz) /rev [.39;.79] [.39;.79] [P2;P3] HRC [23;295] [;2.39] [.79;.7] P1 Mixed Cement 4/ Issue Page / F: / / F:

7 Weld Repair Method Preheating Limit of Interpass Temperature Filler Metal Post Welding Cooling Post Welding Heat Treatment in Hardened Condition Post Welding Heat Treatment in Annealed Condition Welding TIG MMA F (32-38 C) 9 F (48 C) AISI H11 54 F/h max during 3 hours (3 C/h) 111 F - 1H / 6 C - 1H/ mm 85 C - 6 F/3 mn per mm - per + cooling at 5 C - 9 F/h until 62 C - 1 F and air cooling For Information: Industeel Creusot 56 rue Clemenceau Le creusot Cedex Industeel Belgium 266 rue de Chatelet B-63 Charleroi Please contact Tel (Mkt) (Sales) Fax Industeel Loire 118 rue des Etaings - BP 368 F-4283 Rive de Gier Cedex Please contact Tel (Sales) Fax / Issue Page 7 NOTE: Technical data and information are to the best of our knowledge at the time of printing. However, they may be subject to some slight variations due to our ongoing research program on steels. Therefore, we suggest that information be verified at time of enquiry or order. Furthermore, in service, real conditions are specific for each application. The data presented here are only for the purpose of description, and considered as guarantees when written formal approval has been delivered by our company / F: / / F: