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Information Name: | Supply h13 h13 alloy die steel tool steel h13 steel round bar |
Published: | 2012-05-07 |
Validity: | 300 |
Specifications: | h13 specifications 4cr5mosiv1 |
Quantity: | 25000.00 |
Price Description: | |
Detailed Product Description: | H13 Tool Steel Alloy tool steel referred to as alloy tool steel, which is formed by adding alloying elements on the basis of carbon-steel steel. Alloy tool steel: Measuring & Cutting Tool steel, impact resistant tool steel, cold work die steel, hot die steel, non-magnetic die steel, plastic mold steel. H13 is hot work die steel. Perform standard GB/T1299-2000. Unified numbering A20502; Grades of 4Cr5MoSiV1; Chemical composition (wt%): C: 0.32 ~ 0.45, Si: 0.80 ~ 1.20, Mn: 0.20 to 0.50, Cr: 4.75 ~ 5.50 Mo: 1.10 to 1.75, V: 0.80 to 1.20, p ≤ 0.030, S ≤ 0.030; Heat treatment: (Delivery Status: Brinell hardness HBW10/3000 (≤ 235)), quenching: 790 degrees + -15 degrees of warm-up, 1000 (salt bath) or 1010 degrees (oven controlled atmosphere) + -6 degree of heating, insulation 5 ~ 15min air-cooled, 550 + -6 degree of tempering; annealing, thermal processing; Features and Applications: Department of the introduction of the H13 empty hardened hot work die steel. Its performance, use and 4Cr5MoSiV of steel is basically the same, but because of its high vanadium content, temperature (600 degrees) is better performance than 4Cr5MoSiV steel, hot work die steel is so widely used as a representation steel. Common Specifications H13 steel plate width (210-610) * thickness (6-80), hot-rolled H13 steel pipe outside diameter (6-219) * thickness (0.5-25) H13 ingot electroslag ingots 0.35T 0.5T 0.75T 1.0T 1.5T 1.8T 2.0T 2.2T 2.8T (3.0-8.0) T Feature Electroslag re-Yung steel, the steel has high hardenability and thermal cracking capacity, the steel contains a high content of carbon and vanadium, good wear resistance, toughness is relatively weakened, with good heat resistance, higher temperatures, has good strength and hardness, high wear resistance, toughness, good mechanical properties and high resistance to tempering stability. Use Forging die for the manufacture of the impact load, the hot extrusion die, Forging; aluminum, copper and its alloys die-casting mold. Analysis of the chemical composition of the H13 steel H13 steel C-Cr-Mo-Si-V steel, is extremely common in the world, the countries of many scholars it has been extensively studied, and explore the improvement of the chemical composition. Steel is widely used and has excellent characteristics, determined mainly by the chemical composition of steel. Of course the impurity elements in steel must be reduced, there is information that Rm 1 550 MPa when the material sulfur content from 0.005% to 0.003%, will impact toughness increase of about 13J. Very obvious, NADCA 207-2003 standard provides: superior grade (the premium) H13 steel sulfur content less than 0.005%, and super (superior) should be less than 0.003% S and 0.015% P. The following is to analyze the composition of the H13 steel. Carbon: the United States of H13 steel AISI, UNS T20813, ASTM (latest version) of H13 and the Fed QQ-T-570 H13 steel, the carbon content of the provisions of (0.32 to 0.45)%, the range of carbon content of all the H13 steel wide. German X40CrMoV5-1 and 1.2344 carbon content (0.37 to 0.43)%, carbon content of a narrower range of the German DIN17350,, there X38CrMoV5-1 carbon content (0.36 to 0.42)%. Japan SKD 61 carbon content (0.32 ~ 0.42)%. China GB / T 1299 and YB / T 094 in 4Cr5MoSiV1 and SM of 4Cr5MoSiV1 the carbon content (0.32 ~ 0.42)% and (0.32 to 0.45)%, respectively, with the SKD61 and AISI H13. Of particular note are: H13 steel carbon content of the provisions of the North American Die Casting Association of NADCA 207-90,207-97 and 207-2003 standard (0.37 to 0.42)%. Steel carbon content determines the hardness of the hardened steel substrate, can know the curve of the steel carbon content and hardness of hardened steel, H13 steel quenched hardness 55HRC. For tool steel, carbon steel part of the matrix into the steel caused by solid solution strengthening. Another part of the carbon and alloying elements in the carbide forming elements combine to form alloy carbides. Hot work die steel, this alloy carbide addition to the small amount of residual, also called it precipitated in the quenched martensite matrix in the tempering process to produce two hardening. Thus determined by the uniform distribution of the residual alloy carbon compounds and the organization of tempered martensite performance of hot work die steel. Thus, the steel containing C content can not be too low. Containing 5% Cr H13 steel with high toughness, therefore it contains the C content should be maintained at the level of the formation of a small amount of alloy C compounds. Woodyatt and Krauss pointed out that the 870 ° C of Fe-Cr-C ternary phase diagram, the position of H13 steel in the austenite A and (A + of M3C + M7C3) three-phase zone at the junction position is better. Containing C is about 0.4%. The figure also marked the increase in C or Cr content make M7C3 increased volume, with the higher wear resistance of A2 and D2 steel for comparison. It is also important, to maintain a relatively low with C Ms point of the steel to take at relatively high temperature level (H13 steel Ms general information introduced about 340 ℃), so that the steel quenched to room temperature. to obtain martensite mainly to add a small amount of residual A and residues in a uniform distribution of alloy C compounds organizations, and the uniform tempered martensite after tempering. Avoid excessive retained austenite in the operating temperature change affect the work performance or deformation of the workpiece. The small amount of residual austenite in the quenched after two or three times a tempering process should be the change completely. Here in passing that the H13 steel after quenching martensite lath M + M + of a small amount of flake small amount of residual A. By tempering in lath M precipitation of very fine alloy carbides, scholars also made a certain work. As we all know, increase the carbon content of steel will increase the strength of steel, hot work die steel, make the high-temperature strength and hot hardness and wear resistance to improve, but will lead to reduction of its toughness. The performance of the scholars in various types of H-shaped steel tool steel product manual literature will obviously prove this point. Generally considered to lead the boundaries of the steel-plastic and toughness reduce the carbon content of 0.4%. This requires people to follow the following principles: to reduce the carbon content of steel to the extent possible under the premise of maintaining the strength of the steel alloy design, data have been proposed: in the steel tensile strength of more than 1 550 MPa, with C 0.3 % -0.4% is appropriate. H13 steel strength Rm, A Brief Introduction for 1503.1MPa (46HRC when) and 1937.5MPa (51HRC). Access FORD and GM data recommended TQ-1, Dievar and ADC3 steel containing C content of 0.39% and 0.38%, the corresponding index of toughness are listed in Table 1, on the grounds thus Glimpse reach. Require a higher intensity of hot work die steel, H13 steel composition on the basis of Mo content or carbon content, which will be also discussed later, of course, slightly lower toughness and ductility can be expected. 2.2 Chromium: Chromium alloy tool steel contains the most common and inexpensive alloying elements. H-type hot work die steel with Cr content in the range of 2% to 12%. Of alloy tool steel (GB/T1299) 37 steel, except 8CrSi and 9Mn2V contain Cr. Have a beneficial effect of chromium on the steel wear resistance, high temperature strength and hot hardness, toughness and hardenability permeability, at the same time it is dissolved in the matrix can significantly improve the corrosion-resistance of Cr in the H13 steel and Si make the oxide film is compact to improve the oxidation resistance of steel. While Cr to analyze the role of 0.3C-1Mn steel tempering properties, is beneficial to join the resistance of <6% Cr to improve the steel tempered, but do not constitute a secondary hardening; containing Cr> 6% of the steel quenching after tempering at 550 ℃ secondary hardening effect. To heat the steel mold steel to the general election of 5% chromium. Part of the chromium in tool steel integrated into the steel from the solid solution strengthening effect, another part with the carbon, high and low chromium content (of FeCr) 3C, (of FeCr) 7C3 and M23C6 in the form, so as to affect the performance of the steel. Also consider the interaction effects of alloying elements, such as steel containing chromium, molybdenum and vanadium, Cr> 3% [14], Cr can prevent the of V4C3 generation and postpone Mo2C coherent precipitates V4C3 and Mo2C steel high temperature strength and tempering resistance strengthening phase [14], this interaction is to improve the heat deformation properties of the steel. Chromium dissolved in the austenite increase the hardenability of steel. Cr, Mn, Mo, Si, Ni and Cr as increase the hardenability of steel alloying elements. People get used to the hardenability factor to be characterized, in general the available information [15] applied only Grossmann and other information, then Moser and Legat [16, 22] further work with C and austenite grain degree decided to basic quench hardenability factor determined by the permeability of the diameter of Dic and the content of alloying elements (shown in Figure 3) of alloy steel to calculate the ideal critical diameter Di, also available from the following formula for the approximate calculation: Di = Dic × 2.21Mn × 1.40Si × 2.13Cr × 3.275Mo × 1.47Ni (1) (1) alloying elements expressed in mass percentage. By the type, Cr, Mn, Mo, Si and Ni steel quenching quite clear semi-quantitative understanding. Cr steel eutectoid point, and Mn broadly similar, when the chromium content of about 5% of the total analysis points with C down to about 0.5%. In addition, Si, W, Mo, V, Ti and more pronounced the lower the eutectoid point with C content. This can be to know: hot work die steel and high-speed steel as are the eutectoid steel. Eutectoid containing C the amount of reduction will increase the content of alloy carbides in austenite after the organization and the final organization. Steel - Alloy C of objects from its own stability, in fact, Alloy C compounds, structure, stability, and the corresponding C compounds, form elements d electron shell and the S electron shell electronic lack of [17]. Electronic lack of a decline in metal atomic radius decreases, carbon and metal elements of atomic radius ratio rc / the rm increase, Alloy C compounds by the gap opposite the gap compounds change, weakening the stability of the C compounds, the corresponding melting temperature and dissolved in the A temperature is reduced, the absolute value of the free energy of formation decreases, the corresponding hardness values ??decreased. With a face centered cubic lattice of VC carbide, high stability, about 900 ~ 950 ℃ temperature began to dissolve, and above 1100 ℃, a large number of dissolved (dissolution end temperature of 1413 ° C) [17]; it is 500 ~ 700 ℃ precipitation in the tempering process, not easy to gather grew up, as a strengthening phase in the steel. Medium carbide forming elements W, M2C and MC carbides of Mo formed a close-packed and simple six-party lattice, their stability is poor more, also with high hardness, melting point and melting temperature, can still be as in 500 ~~ 650 ℃, the use of steel reinforcement. Of M23C6 (Cr23C6, etc.) has a complex cubic lattice, the stability is poor, combined with weaker strength, low melting point and melting temperature (1090 ℃ integrated into the A), only a small number of heat-resisting steel by the integrated alloying have higher stability ((CrFeMoW) 23C6 can be used as reinforcement. M7C3 has a complex hexagonal structure (such as Cr7C3, Fe4Cr3C3 or Fe2Cr5C3), stability is poor, and Fe3C class carbide dissolution and precipitation , a large gathering grew up speed, normally it can not be used as high temperature strengthening phase [17]. We still can understand simple ternary phase diagram of Fe-Cr-C alloy carbide phase in the H13 steel. [18 20] of Fe-Cr-C system in 700 ° C and 870 ° C [9] three yuan isothermal cross-section of the phase diagram, containing 0.4% C steel with Cr content increase will appear (of FeCr) 3C (of M3C) and (CrFe) 7C3 (M7C3) type alloy carbides. Note that the map of 870 ℃, only containing Cr appear greater than 11% of M23C6). In addition, the vertical cross section of Fe-Cr-C ternary system at the 5% Cr, 0.40% C steel in the annealed condition is α phase (solid solution of about 1% Cr) and (CrFe) 7C3 alloy, C compounds. When heated to 791 ° C above the formation of austenite A and enter the (α + A + M7C3) phase regions, into the two-phase region (A + M7C3), about 970 ° C (CrFe) 7C3 disappeared at about 795 ℃, into single-phase A. Matrix containing C <0.33% at about 793 ℃ (M7C3 + M23C6 and A) three-phase regions, in 796 ° C into the (A + M7C3) District (0.30% C), the future has been maintained until fluid phase. Residual steel M7C3 prevent A grain growth. Nilson put forward, the composition of 1.5% C-13% Cr alloy, less stable (CrFe) 23C6 is not formed [20]. Of course, a single analysis of Fe-Cr-C ternary system, there will be some deviation, to consider the effects of alloying elements. H13 heat treatment process Steel and die blanks of a pre-heat treatment on the market supply of H13 steel in the steel mills have been well annealing, to ensure a good microstructure, proper hardness, good workability, and no further annealing. Factory change wrought destruction of the organization and performance, increase the forging stress, you must re-annealing. Isothermal spheroidization annealing process is: 860 ~ 890 ° C heat insulation 2h, cooling to 740 ~~ 760 ℃, temperature and 4h, furnace cooling to 500 ℃, baked. 2 quenching and tempering toughness, good mold hardening process specifications: heating temperature of 1020 ~ 1050 ℃, oil cooling or air cooling, hardness 54 ~ 58 HRC; quenching process specification based thermal rigid mold, the heating temperature of 1050 ~ 1080 ° C, The oil is cold, hardness 56 ~ 58 HRC. Recommended tempering temperature: 530 ~ 560 ° C, the hardness of 48 ~ 52HRC; tempering temperature of 560 ~ 580 ℃; hardness 47 ~ 49HRC. Tempering should be carried out twice. To 500 ℃ tempering, tempering secondary hardening peak, the highest tempering hardness peak at about 55HRC, but the toughness of the worst. Therefore, the tempering process should avoid about 500 ℃ appropriate. Need based on the use of molds, tempering in the range of 540 ~ 620 ℃. Quenching the two warm-up (600 ~ 650 ℃, 800 ~ 850 ° C), heat stress to reduce the heating process. The chemical heat treatment of H13 steel For gas nitriding carbon or nitrogen permeation allows mold to further strengthen, but the nitriding temperature should not exceed the tempering temperature to ensure the strength of the core part is not reduced, thereby enhancing the life of the mold. Hardness Analysis Steel carbon content determines the hardness of the hardened steel substrate, can know the carbon content in steel and hardened steel hardness curve, H13 die steel quenched hardness 55HRC about. For tool steel, carbon steel part of the matrix into the steel caused by solid solution strengthening. Another part of the carbon and alloying elements in the carbide forming elements combine to form alloy carbides. Hot work die steel, this alloy carbide addition to the small amount of residual, also called it precipitated in the quenched martensite matrix in the tempering process to produce two hardening. Thus determined by the uniform distribution of the residual alloy carbon compounds and the organization of tempered martensite performance of hot work die steel. Mechanical properties: Hardness: annealing, quenching, 245 ~ 205HB, ≥ 50HRC |
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Copyright © GuangDong ICP No. 10089450, Hangzhou Yanagida Metal Materials Co., Ltd. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility