A2
A2 properties and heat treatment forged piece, Including A2 application and specifications, We have all specifications，Including A2 steel plate, A2 sheet, A2 square steel, A2 flat bar,A2 round bar,A2 forgings, we can own production and sales.
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We can produce the A2 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 A2 and Standards
|
BS4659 BA2 is a cold work, air hardening tool steel, which offers high surface hardness in hardening, good wear resistance, great through hardenability. A2 tool steel is also characterised by its high dimensional stability after hardening and tempering, high compression resistance and good resistance to tempering. |
| Typical Analysis | ||||
|
C. |
Mn. |
Cr. |
W. |
V. |
|
0.95% |
1.25% |
0.50% |
0.50% |
0.20% |
Forging:
Heat slowly and uniformly to 700°C. Forge within a range of 1050/1100°C, reheating if necessary. Cool ver y slowly (preferably in a furnace) to avoid setting up stresses.
Annealing:
Heat uniformly to 850°C, equalise, then furnace cool. (Hardness about 215 Brinell). Fully machined tools should be packed during annealing.
Stress Relieving:
If machining operations have been heavy or if the tool has an unbalanced section, remove stresses before hardening by heating up to 675°C, equalise, then cool in furnace to 500°C before slowly cooling in air.
Hardening:
Pre heat to 600/700°C and thoroughly soak. Continue heating to the final hardening temperature of 950/980°C. Allow sufficient time for the component to be heated through. Quench in oil or cool in air.
Martempering:
Martempering is an alternative hardening procedure which may be used when suitable salt bath equipment is available.
Tempering:
Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness.
| Tempering °C |
150 |
200 |
250 |
300 |
350 |
400 |
| HRc |
62/61 |
61/60 |
60/59 |
659/580 |
58/57 |
58/57 |
Hard Chromium Plating:
After hard chromium plating tempering of A2 tool steel is recommended at 180°C for 4 hours to avoid hydrogen embrittlement. Tempering is to be performed immediately after chromium plating.
Welding:
Due to the high risk of crack formation welding of A2 tool steel should be avoided, if possible. When, howe ver Welding is essential, the following serves as a guide:
A. Welding of soft annealed A2 tool steel
· Preheat to 300 - 500°C.
· Weld at 300-500°C.
· Immediately stress relieve.
Electrode: Cr-Mo alloy electrode for Welding structural steel.
B. Welding in connection with hardening of soft annealed A2 tool steel.
· Heat to austenitizing temperature.
· Cool to approx. 500°C.
· Weld at approx. 500°C.
· Cool to approx. 100°C in the same way as at normal hardening, then temper to desired hardness.
Electrode: Hard facing electrode.
C. Repair Welding of A2 tool steel in hardened and tempered condition.
· 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 3 hours.
· Cool in air to approx. 80°C.
· Heat to tempering temperature. Soaking time 2 hours.
Electrode: Hard facing electrode.
| Physical Properties: | Temperature: | ||
| 20°C | 200°C | 400°C | |
| Density (Kg/dm³) | 7.75 | 7.70 | 7.65 |
| Coefficient of thermal expansion (per °C from 0°C) | - | 11.6 x 10-6 | 11.3 x 10-6 |
| Thermal conductivity (cal/cm.s °C) | 62.4 x 10-3 | 64.8 x 10-3 | 68.4 x 10-3 |
| Specific heat (cal/g °C) | 0.110 | ||
| Modulus of elasticity: | |||
| Kp/mm² | 19 370 | 18 900 | 17 325 |
| N/mm² | 189 900 | 185 200 | 169 800 |
Machining performance
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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.