Description
UTOPMO4 is a 5% chromium hot work tool steel designed particularly for applications requiring extreme toughness combined with good red hardness.It provides an extra margin of safest in tools subject to heavy hammer blows, and those tools containing deep recesses or sharp corners.While UTOPMO4 has been designed primarily as a hot work tool steel, it has been used in many cold work applications where extra toughness is required at the sacrifice of some wear resistance.
Applications
UTOPMO4 has been used primarily for tools requiring resistance to softening at elevated temperatures.Such tools include forging dies and punches, die-casting dies, aluminum extrusion dies, hot heading dies, piercing and forming punches, etc.
Physical properties (avarage values) at ambient temperature
| Modulus of elasticity [103 x N/mm2] |
215 |
| Density [g/cm3] |
7.70 |
| Thermal conductivity [W/m.K] |
25.0 |
| Electric resistivity [Ohm mm2/m] |
0.52 |
| Specific heat capacity[J/g.K] |
0.46 |
Soft Annealing
Heat to 760-820oC, cool slowly in furnace.This will produce a maximum Brinell hardness of 250.
Stress Relieving
To relieve machining strains for greater accuracy in hardening, first rough machine, then anneal below the critical 649/677oC a minimum of one hour at temperature, and cool very slowly, followed by finish machining.
Hardening
Harden from a temperature of 1000-1040oC followed by air, oil warm bath (450-550oC) quenching.Hardness after quenching is 54-58 HRC.
Forging
Heat slowly and uniformly to a temperature of between 1093/1135oC and forge.Do not work the steel below 927oC.Reheat as often as necessary.
Machinability
The machinability of UTOPMO4 may be rated between 55% and 65% of a 1% carbon water hardening tool steel, or about 40% to 50% of B1112.
Weldability
To salvage tools and dies by welding, preheat to 538oC in a furnace and weld with uncoated arc equipment (atomic hydrogen or heliarc).Keep the temperature of the die above 316oC at all times by reheating until the welding is completed.Upon completion of the weld, return the work piece to the preheating furnace, equalize, and cool in the furnace.Welding should be performed in the annealed condition.However, if welding is performed in the hardened condition, the tool should be retempered at 538oC after hardening.The electrode material used in the weld rod should be of similar analysis to the base material.
Company information
Bozhong Group Mainly supply in forms of coil, sheet, plate, rod, bar, tube, pipe, beam, angle, flange, wire, strip, channel, etc., with various varieties, wide range of dimensions, high purity, stable chemical composition, high dimensional accuracy and excellent surface quality. The products are mainly used in the fields of industries such as automobile engineering, railway transportation, aviation, aerospace, machinery, petrochemical, energy, environmental protection, offshore, chemical, oil & gas, ilitary, power plant, nuclear power, pressure vessel, boiler equipment, mold manufacture, etc.
Bozhong Group can supply a variety of structural steel, high-strength steel, wear-resistant steel plate, boiler and pressure vessel steel, marine engineering and stainless steel plate in the thick steel and various European standard bars and pipes and profiles.Our global sales and service network throughout all around the world to ensure that the goods reach the customer in the shortest time.
We can follow your drawings and requirements, to provide you with oxygen cutting, plasma cutting and laser cutting and other processing services. You can also perform ultrasonic testing in accordance with EN10160 standard, EN10164 standard test Z15, Z25, Z35, weld bending detection, PWHT detection,etc.
We have ISO9001: 2000 quality management system certification, and obtain the quality certification from all the well-known certification company, including TuV / LRS / GL / CE and so on.
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