BS4659 BO1
BS4659 BO1 properties and heat treatment forged piece, Including BS4659 BO1 application and specifications, We have all specifications，Including BS4659 BO1 steel plate, BS4659 BO1 sheet, BS4659 BO1 square steel, BS4659 BO1 flat bar,BS4659 BO1 round bar,BS4659 BO1 forgings, we can own production and sales.
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Specialized high quality steel
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forged/hot rolling/ extrusion of steel
We can produce the BS4659 BO1 has the following specifications:
Round bar steel: 1mm to 3000mm
Square-shape steel: 1mm to 2000mm
Plate steel:0.1mm to 2500mm
Width: 10mm to 2500mm
Lenth: We can supply any lenth based on the customer's requirement.
Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Tubings: OD: φ6-219 mm, with wall thickness ranging from 1-35 mm.
Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement
Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirementExcellent service for all kinds of industries,with advantages of technologies, equipment and price.
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Chemical composition % of the ladle analysis of grade BS4659 BO1 and Standards
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BS4659 BO1 is a high quality non-distorting cold work tool steel. With combined manganese chromium tungsten O1 tool steel is characterised by giving high surface hardness after tempering, good dimensional stability in hardening, and good
machinability. |
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Typical Analysis - O1 tool steel
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C.
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Mn.
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Cr.
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W.
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V.
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0.95%
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1.25%
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0.50%
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0.50%
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0.20%
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Heat slowly and uniformly to 1000°C. Forge within a range of 1000/800°C reheating if necessary. Cool slowly (preferably in a furnace) to avoid setting up stresses.
Heat uniformly to 770°C, equalise, then furnace cool. (Hardness about 229 Brinell). Fully machined tools should be packed during annealing.
If machining operations have been heavy or if the tool has an unbalanced section, remove stresses before hardening by heating up to 650°C, equalise, then cool slowly.
Heat uniformly to 780/820°C until heated through. (If possible pre-heat at 300/500°C). Allow 30 minutes per 25 millimetre of ruling section and quench immediately in oil.
Martempering is an alternative hardening procedure which may be used when suitable salt bath equipment is available.
Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness.
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Tempering °C
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100
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150
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200
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250
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300
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350
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HRc
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64/63
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63/62
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62/61
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60/59
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58/57
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56/55
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After hard chromium plating tempering of O1 tool steel is recommended at 180°C for 4 hours to avoid hydrogen embrittlement
Due to the high risk of crack formation welding of O1 tool steel should be avoided, if possible. When, however Welding is essential, the following serves as a guide:
· Preheat to 300 - 500°C
· Weld at 300 - 500°C
· Immediately stress relieve
Electrode: Cr-Mo alloy electrode for Welding structural steel.
· Heat to hardening temperature.
· Cool to approx. 500°C
· Weld at approx. 500°C
· Direct re-heating to hardening temperature whereafter hardening (quenching) is performed in the usual way.
Electrode: Hard facing electrode.
· Preheat to the tempering temperature (min. 200°C) previously used.
· Weld at tempering temperature.
· Heat immediately to tempering temperature, but max. 300°C. Soaking time 2 hours.
Electrode: Hard facing electrode.
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Physica Properties:
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Temperature:
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20°C
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200°C
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400°C
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Density (Kg/m³)
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7.8
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7.75 7.70
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Coefficient of thermal expansion (per °C from 0°C)
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-
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11.7 x 10-6
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11.4 x 10-6
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Thermal conductivity (cal/cm.s °C)
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76.8 x 10-3
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79.2 x 10-3
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11.4 x 10-6
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Specific heat (cal/g °C)
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110.4 x 10-3
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Modulus of elasticity:
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t.s.i.
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12310
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11990
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11020
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Machining performance
Download BS4659 BO1 the mechanical properties of the report, the report provides detailed performance analysis and application. Download >>
Principal Design Features
One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high harness, toughness and strength.
Machinability
Long, gummy chips characterize this alloys machinability. It can be machined in the annealed condition, however condition H1150M will yield best results. Post machining solution treatment of parts will be required prior to final hardening if machining in this condition.
Heat Treatment
CONDITION A--Soak at 1900 F (1038 C) for 30 minutes and cool below 60 F (16 C) for complete martensite transformation. CONDITION H 950- Treat Condition A material at 900 F(482 C) for 1 hour, air cool.. CONDITION H925, H1025, H1075, H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, CONDITION H1150M- Soak solution treated material at 1400 F (760 C) for 2 hours, air cool, then re-heat to 1150 F (620 C) for 4 hours and air cool.
Welding
Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.
Forging
Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.