a6
a6 properties and heat treatment forged piece, Including a6 application and specifications, We have all specifications，Including a6 steel plate, a6 sheet, a6 square steel, a6 flat bar,a6 round bar,a6 forgings, we can own production and sales.
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We can produce the a6 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.
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Chemical composition % of the ladle analysis of grade a6 and Standards
A6 de-carb free tool steel is an air hardening tool steel with higher manganese and lower chromium and carbon than A2, offering moderate wear resistance and toughness. It has the advantage of hardening from a lower austenitizing temperature for easy heat treatment. A6 hardens with very little movement or distortion. A6 offers medium resistance to softening at elevated work temperatures, medium to high resistance to decarburization, and has good machinability. One main advantage of A6 is its deep hardening with high safety in hardening.
ANALYSIS
| Carbon (C) | Manganese (Mn) | Silicon (Si)
Max |
Chromium (Cr) | Molybdenum (Mo) | Phosphorus (P)
Max |
Sulfur (S)
Max |
| 0.65-0.75 | 1.8-2.5 | 0.5 | 0.9-1.2 | 0.9-1.4 | 0.03 | 0.03 |
A.I.S.I. A6 conforms to ASTM A681
APPLICATIONS
Typical applications for A6 tool steel are blanking dies, forming dies, trim dies, stamping dies, coining dies, notching dies, bending tools, rim rolls, punches, cams, thread roll dies, spindles, retaining rings, master hobs, precision tools, mandrels, compression molds, plastic molds requiring high hardness, ball screws, lead screws, general purpose tooling, etc.
HEAT TREATING
FORGING
Heating for forging must be done slowly and uniformly. Soak through at 1900°-2000°F and reheat as often as necessary, stopping work when the temperature drops below 1600°F. After forging, cool slowly in lime, mica, dry ashes or furnace. A6 should always be annealed after forging.
ANNEALING
Heat slowly to 1350°-1375°F, hold until entire mass is heated through, and cool slowly in the furnace (20F per hour) to about 1000°F, after which cooling rate may be increased. Suitable precautions must be taken to prevent excessive carburization or decarburization.
STRESS RELIEVING
When desirable to relieve the strains of machining, heat slowly to 1050°-1250°F, allow to equalize, and then cool in still air (Strain Relieving).
PREHEAT PRIOR TO HARDENING
Preheating is often not necessary depending on the size and complexity of the part. If a preheat is desirable, a 1200°-1250°F temperature should be used. Heat slowly.
HARDENING
Parts at room temperature or as pre-heated should be placed in a hardening furnace operating at 1525°-1600°F. After parts have reached the furnace temperature, hold 20 minutes for small parts and up to 45 minutes for large parts
QUENCHING
A6 is a deep hardening tool steel and will reach full hardness by cooling in freely circulating air.
TEMPERING
A single temper (one hour at temperature for small pieces; proportionately longer time for larger sizes) is usually all that is required with tempering carried out in the range of 300°-1000°F. For most applications, the best combination of hardness and toughness is accomplished at 350°-400°F. Specimens 1 inch square by 3 inches long were air hardened from 1550°F and tempered at various temperatures for two hours. The resulting harnesses were as follows:
| Tempering Temperature F | Rockwell C | Tempering Temperature F | Rockwell C | ||||
| 300 | 62 | 800 | 52 | ||||
| 350 | 60 | 900 | 51 | 400 | 59 | 1000 | 49 |
| 500 | 58 | 1100 | 47 | ||||
| 600 | 56 | 1200 | 41 | ||||
| 700 | 54 |
TOLERANCES
AISI A6 Air Hardening tool steel
-
Rounds
-
Moneysaving thins
-
Machine finished flats FOUR SIDES
DESCRIPTION
An air-hardening tool steel with properties similar to A4 and A5 with lower hardness and higher toughness. Dimensional stability with high hardenability and good impact strength is characteristic of this grade.
ADVANTAGES
-
Low distortion in heat treatment
-
High hardenability
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Good toughness
-
Medium wear resistance
-
Machinability-medium
TYPICAL ANALYSIS
CARBON …………………0.70 MANGANESE ………………2.00
MOLYBDENUM ………1.00 CHROMIUM …………………1.00
HEAT TREATMENT
FORGING ………………………………..1900°F to 2050°F
NORMALIZING ………………………...Do not normalize
ANNEALING ……………………………1350°F to 1375° F
ANNEALED HARDNESS ………………217-248 BHN
PREHEATING ……………………………1200°F – prior to hardening
HARDENING …………………………….1525° – 1600°F, air quench to 150°F
TEMPERING RESULTS
Quenched @ 1550°F.
| Tempering Temperatures °F |
Hardness Rockwell C |
| 200 | 61.5 |
| 300 | 60.5 |
| 400 | 59.0 |
| 500 | 57.5 |
| 600 | 56.0 |
| 700 | 54.5 |
| 800 | 52.5 |
| 900 | 50.5 |
| 1000 | 48.5 |
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.