ALUMINIUM ALLOY B51 S(ANNEALED)/ AA6351 ’0’ Condition SHEETS
SLNO. / SPECIFICATION / Thickness
in mm / Width X Length
in mm / ORDER QTY.
IN Kgs.
1 / Al.Alloy B51S (ANNEALED) / 2 / 1220X2440 OR 1000X2000 / 3000
2 / Al.Alloy B51S
(ANNEALED) / 3 / 1220X2440 OR 1000X2000 / 3000
TOTAL= / 6000
FPD/MMD/28/15
VSSC: FPD: 6351S -2013
SPECIFICATION FOR ALUMINIUM ALLOY AA6351 SHEET AND PLATE
1.0SCOPE
This specification covers flat sheet of Aluminium Alloy AA6351 in O, T4 and T6 temper conditions, and plate in O, T451, and T651 Temper Conditions for non pressurized structural members. This specification is also applicable for the nearest equivalent designations B51S/ IS: 64430/ B.S.: H30.
2.0APPLICABLE DOCUMENTS
2.1The following standards from a part of this specification to the extent specified herein. The latest issue of these documents in effect on the date of material purchase shall be applicable.
2.2ASTM Standards
ASTM B 557M / : / Tension testing of Wrought and Cast Aluminium and Magnesium Alloy products (Metric).ASTM B597 / : / Recommended Practice for Heat Treatment of Aluminum Alloys.
ASTM E 3 / : / Preparation of Metallographic Specimens.
ASTM E 10 / : / Brinell Hard of Metallic Materials.
ASTM E 34 / : / Chemical Analysis of Aluminium and Aluminium Alloy.
ASTM E 112 / : / Estimating the Average Grain size of Metal.
ASTM E 227 / : / Optical Emission Spectrometric Analysis of Aluminium Alloys by the point to plane technique.
ASTM E 340 / : / Macro–etching of Metals and Alloys.
ASTM E 407 / : / Macro–etching of Metals and Alloys.
ASTM E 607 / : / Optical Emission Spectrometric analysis of AluminiumAlloys by the Point to Plane Technique (Nitrogen Atmosphere).
2.3Aerospace Material Specifications
AMS 2202 / : / Tolerance of Aluminium and Magnesium Alloy Sheet and Plates.AMS 2630 / : / Ultrasonic Inspection of Products over 0.5” (12.5mm) thick
2.4Military Standards
MIL-STD-129 / : / Marking for Shipment and Storage.MIL-STD-649 / : / Preparation for storage and Shipment of Aluminium and Magnesium Products.
3.0CHEMICAL COMPOSITION
3.1Shall conform to the following percentage by weight, determined in accordance with ASTM E 34 or E 227 O E 607.
ELEMENT / PERCENTAGE BY WEIGHTMinimum / Maximum
Magnesium / 0.40 / 0.80
Manganese / 0.40 / 0.80
Silicon / 0.70 / 1.30
Iron / ----- / 0.50
Copper / ----- / 0.10
Zinc / ----- / 0.20
Titanium / ----- / 0.20
Other Impurities, each / ----- / 0.05
Other Impurities, total / ----- / 0.15
Aluminium / ----- / Remainder
3.2Sampling Plan for Chemical Analysis
Conformation to chemical composition shall be determined by the producer by analysis samples taken at the time the ingots are poured, or from the finished product.
3.2.1Number of samples: The number of samples taken for determination of chemical composition shall be as follows.
3.2.1.1When samples are taken at the time the ingots are poured, at least one sample shall be taken for each group of ingots poured simultaneously from the same source of molten metal. Complete ingot analysis records shall be available at the producer’s plant to the purchaser.
3.2.1.2When compliance with 3.2.1.1 cannot be established, samples from finished product shall be selected as specified in 3.2.1.2.1 or 3.2.1.2.2 for the type of product being tested.
3.2.1.2.1For sheet, one sample shall be selected for each 900 kg. or fraction thereof of a lot.
3.2.1.2.2For sheet, one sample shall be selected for each 1800 kg. or fraction thereof of a lot.
3.2.2Lot Definition
An inspection lot shall consist of an identifiable quantity of the material of the same mill form, alloy temper and thickness traceable to a heat treated lot and subjected to inspection at one time.
4.0MACRO – ETCH TEST
4.1Macro-etch test shall be carried out at the billet or slab stage prior to rolling of the sheet or plate.
4.2Macro-etch samples shell be taken from the billet or slab representing a location, both top and bottom of the ingot after adequate removal of metal to eliminate piping and other harmful defects. The test shell be carried out on the entire cross section of the billet or slab.
4.3Macro-etch test shell be carried out in accordance with ASTM E 340. Structure shell be free from columnar grain, discontinuities and voids such as seams, laps, porosity, cracks, etc.
5.0SUPPLY CONDITION
5.1Sheet: Sheets covered by this specification of classified as three types depending on the heat treatment given:
The products shell be supplied in the following conditions.
5.1.1Annealed to OTemper.
5.1.2Solution heat treated and naturally aged to T4 Temper.
5.1.3Solution and precipitation heat treated to T6 Temper.
5.2Plate: Plate covered by this specification are classified as three types depending on the heat treatment given.
5.2.1Annealed to O Temper.
5.2.2Solution heat treated, stretched to produce a nominal permanent set of 2% but not less then 1.5% nor more than 3% and naturally aged to T451 Temper.
5.2.3Solution heat treated, stretched to produce a nominal permanent set of 2% but not less then 1.5% nor more than 3% and naturally aged to T651 Temper.
5.2.4Plates shall receive no further straightening operations after stretching for T651 Temper.
5.3The Temper condition shall be as specified in the purchase order.
5.4Surface Finished: Standard uniform bright finish on each side.
6.0HEAT TREATMENT
6.1Shall be carriedout in accordance with ASTM B 597.
6.2Heat Treatment Furnace
Can be treated in either molten salt baths or air chamber furnaces. When using for salt baths, temperature has to be carefully controlled and use of nitrate baths in to be avoided for aluminium-magnesium alloys. Air chamber furnaces may be oil-or-gas fired or may be electrically heated (Air circular electrically heated furnace is preferable). The atmosphere in air chamber furnaces must be controlled to prevent high-temperature oxidation during solution heat treatment.
6.3Calibration
Heat treatment equipment is to be calibrated for ensuring uniform and correct temperature as per ASTM B 597.
6.4Heat Treatment cycle
6.4.1Heat Treatment to “O” Temper.
------Metal Temper
± 5ºC / Time at Temperature
hours
------
405 (A) / 2 to 3
------
(A)-Cooling rate must be 28ºC per hour up to 260º C. The rate for subsequent cooling is unimportant.
6.4.2Heat treatment to T4, T451, T6 & T651 Temper
Solution Heat Treatment / Precipitation Heat treatment (C)Metal Temperature,
±5ºC (A) / Quench temperature,
ºC (B) / Temper / Metal Temperature,
±5ºC (A) / Time at Temperature,
hours / Temper
525 / 38 Max. / T451 (D) / 177 / 8 / T651 (D)
(A)-Recommended soaking time to achieve specified metal temperature appear in section 6.4.2.1
(B)-Unless otherwise indicated, when material is quenched by total immersion in water, the water should be at room temperature and suitably cooled to remain below 38ºC during the quenching cycle.
(C)-Typical or nominal time at temperature.
(D)-Stress relived by cold stretching to a permanent set of 1.5% to 3% in the solution heat treated and precipitation heat treated condition.
6.4.2.1Minimum soaking time required for solution treatment
Thickness, mm (B) / Soaking time in minutes (A)Salt bath (C)
(min) / Air furnace (D)
(min)
0.50 / and / Under / 10 / 20
0.51 / to / 0.80 / 15 / 25
0.81 / to / 1.60 / 20 / 30
1.61 / to / 2.30 / 25 / 35
2.31 / to / 3.15 / 30 / 40
3.16 / to / 6.35 / 35 / 50
6.36 / to / 1270 / 45 / 60
12.71 / to / 25.40 / 60 / 90
25.41 / to / 38.00 / 90 / 120
38.10 / to / 51.00 / 105 / 150
51.10 / to / 63.50 / 120 / 180
63.51 / to / 76.20 / 150 / 210
76.21 / to / 88.90 / 165 / 240
88.91 / to / 101.60 / 180 / 270
(A)-Shorter soaking times are satisfactory when the soak time is accurately determined by thermocouples attached to the load or when other metal temperature measuring devices are used.
(B)-The thickness is the minimum dimension of the thickest section.
(C)-Shaking time is salt-bath furnaces should be measured from the time of immersion, except when, owing to a large, the temperature of the bath drops below the specified minimum; in such cases, soaking time should be measured from the time the bath reaches the specified minimum.
(D)-Soaking time in air furnaces should be measured from the time all furnace control instruments indicate recovery to the minimum of the process range.
6.4.2.2Maximum Allowable Quench Delay Time (For immersion type Quenching)
Quench delay time shall begin when the furnace door begins to open or when the first corner of a load emerges from a salt bath and when the last corner of the load is immersed in the water.
Nominal Thickness, mm / Max. Time, SecondsUp to / 0.406 inch / 5
0.432 / to / 0.787 / 7
0.813 / to / 2.286 / 10
2.311 / and / over / 15
6.5The heat treatment practice described in the above sections is typical. Optimum heat treatment cycle to achieve the property requirements of this specification shall be generated by the supplier shell be reported.
7.0MECHANICAL PROPERTIES
7.1Tensile Properties
7.1.1The sheet and plate shall conform to the requirement for tensile properties as specified in table 7.1.1
TABLE - 7.1.1. : TENSILE PROPERTY REQUIREMENT (A)
Product / Temper / Specified Thickness, mm / Tensile strength MPa min. / Yield Strength at 2% offset, MPa min / Elongation min.,%Over / Through / In 50mm or 4D / In 5D or 5.65√A
Sheet / O / 0.40 / 6.30 / 110 (min)-175(B) / ---- / 16 / ----
T 4 / 0.40 / 6.30 / 2.5 / 115 / 15 / ----
T 6 / 0.40 / 6.30 / 300 / 255 / 8 / ----
Plate / T 451 / 6.30 / 9.50 / 205 / 115 / 15 / ----
T 651 / 6.30 / 9.50 / 290 / 245 / 8 / ----
(A)-Tensile property requirements for plates not covered by this specification shall be as agreed upon by purchaser and supplier.
(B)-175 MPa shall be the maximum value.
7.1.2Sampling for tensile properties
7.1.2.1Number of Samples and number of Specimen
7.1.2.1.1For steel, one sample shall be selected for each 900 kg or fraction thereof of a lot for making three specimens.
7.1.2.1.2For plate, one sample shall be selected for each 1800 kg or fraction thereof of a lot for making three specimens.
7.1.2.2Specimen Orientation, Location and Size
7.1.2.2.1Specimen shall be taken perpendicular to the direction of rolling from widths of 229 mm and greater, and parallel to the direction of rolling from widths less the 229 mm.
7.1.2.2.2The Standard12.5mm wide rectangular tensile test specimen on pin-loaded tensile test specimen with 50 mm gauge length of ASTM B 557M shall be used for sheet and plate less than 12.5mm in thickness.
7.1.2.2.3For plate 12.5 mm and greater in thickness, the standard 12.5 mm round tensile test specimen with 62.5 mm (5 times Dia. Or 5.65√A) GAUGE LENGTH OF ASTM B 557m or smaller round specimen proportional to it shall be used. The tensile test specimen shall be taken midway between the two surfaces of plate 12.5mm through 37.5mm in thickness and midway between the centre and surface of plate over 37.5 mm in thickness.
7.1.3The tension test shall be done in accordance with ASTM B 557M.
7.2HARDNESS TEST
7.2.1The hardness shall be checked in accordance with ASTM E 10.
7.2.2The hardness values shall not be lower than 32 HB/10/500 for O Temper, 60HB /10/500 FOR T4/T451 Tempers and 95 HB/10/500 for T6/T651 Tempers. However, the product shall not be rejected on the basic of hardness if the applicable tensile property requirements as per table 7.1.1 are met.
8.0QUALITY
8.1Sheet and plate as received by the purchaser, shall be uniform in quality and condition, sound and free from foreign materials and from internal and external imperfections detrimental to the usage of the sheet and plate.
8.2Ultrasonic Inspection
8.2.1For sheet and plate below 12.5mm in nominal thickness, ultrasonic inspection shall be done at billet level as per AMS 2630B (normal beam) and the acceptance level shall be QUALITY CLASS A (single defect dia. 2.0mm FBH and multiple/ linear defects dia 1.2mm FBH)
9.0METALLURGICAL ANALYSIS
9.1Metallographic examination shall be carried out as per ASTM E3 AND E 407.The material shall be of uniform grain size and free from micro-porosity, stringers, segregation etc.
9.2Eutectic Melting and High-Temperature Oxidation.
9.2.1High-Temperature Oxidation and eutectic melting samples shall be sectioned, polished to appropriate fineness and the un-etched surface examined at 500 magnifications to detect evidence of high-temperature oxidation. The section may then be mildly etched (for 2 seconds) in kellers reagent to reveal evidence of eutectic melting. The high-temperature oxidation test is applicable only to material solution heat treated in air furnaces.
9.2.2There shall be no eutectic melting and no evidence of high temperature oxidation.
9.3Samples for Metallurgical Analysis Shall be taken as described in Section 7.1.2.1.in the event of sheets/plates of different thickness are involved in a single heat treatment batch, micro analysis of all items shall be carried out.
9.4Grain Size: Average grain width shall be less than 150µm and average grain length shall be less than 450µm.
10.0DIMENSIONAL TOLERANCES
10.1Unless Otherwise Specified, Tolerances Shall Conform To All Applicable General requirements of BS 4L100/AMS 2202/MAM 2202.
11.0IDENTIFICATION MARKING: As per 1.0 of VSSC: FPD: GEN-1:2013.
12.0PPRESERVATION AND PACKING: As per 2.0 of VSSC: FPD: GEN-1:2013.
13.0RE-SAMPLING AND RE-TESTING: As per 3.0 of VSSC: FPD: GEN-1:2013.
14.0INSPECTION: As per 4.0 of VSSC: FPD: GEN-1:2013.
15.0CERTIFICATES AND REPORTS: As per 5.0 of VSSC: FPD: GEN-1:2013.
16.0REJECTION: As per 6.0 of VSSC: FPD: GEN-1:2013.
VSSC: FPD: GEN-1:2013
GENERAL REQUIREMENTS FOR SHEET, PLATE, EXTRUSIONS AND FORGINGS OF ALUMINIUM ALLOYS AND MAGNESIUM ALLOYS
1.0IDENTIFICATION MARKING
1.1FOR SHEET, PLATE, AND EXTRUSION PRODUCTS
1.1.1 Each sheet and plate shall be marked over the surface at intervals of 250mm and not less than 300mm and each extrusion product over the surface with the following details.
1.1.1.1→ Manufacturer’s Name
→ Specification
→ Heat number
→ Ingot Number and serial Number
→ Size
→ Alloy Number and Temper
→ Thickness
→ Purchase Order Number
→ Inspector’s stamp for clearance
1.1.2The character shall be of such size as to be legible shall be applied using a suitable marking fluid and shall be sufficiently stable to withstand normal handling. The marking shall have no deleterious effect on the product or its performance.
1.1.3The product shall be packed in such a way to provide adequate protection during normal handling and transportation and each package shall contain only one size, alloy and temper of the material otherwise agreed.
1.1.3.1 Each packing shall be identified with the following details.
→ Specification Number
→ Suppliers name
→ Alloy Number and temper
→ Size
→ Purchase Order Number
→ Gross Weight and Net weight
→ Packaging acceptance stamp
1.1.4Marking for shipment of material shall be in accordance with MIL-STD 129.
1.2 FOR FORGINGS
1.2.1Each forging shall be steel impression stamped/punched or ink marked with the information required by 1.1.1.1. in addition ,the forging/part number shall also be given.
1.2.2For hand forging an arrow indicating the direction of longitudinal grain flow shall be included in the marking.
1.2.2.1The marking on square or rectangular hand forgings shall be on a face parallel to the long transverse grain direction. The marking location for other hand forging such as rounds, biscuits or contoured shapes shall be at the option of the forging vendor, unless otherwise specified.
1.2.3For ring forging, an arrow indicating the direction of predominant grain flow shall be applied where this direction is other than circumferential.
1.2.4 Marking for forging stock shall be as agreed upon by purchaser and vendor.
1.2.5Identification of forgings shall be in accordance with AMS 2808.
2.0PRESERVATION AND PACKING
Preservation and protection during packaging shall conform to level A of MIL-STD-649, the degree required for protection against the most severe conditions known or anticipated to been countered during shipment, handling and storage.
2.1CLEANING
Surface shall be cleaned thoroughly by non corrosive solvent like acetone to remove any free loose mill scale/loose particles, dirt or corrosion. The presence of residual rolling oil shall not be considered as foreign matter.
2.2PRESERVATION
Oil used for preservation of products shall conform to the requirements of the standard. Products shall be oiled in all tempers except Alclad products and sheets and plates shall be interleaved.
2.2.1Application for Preservative Coating
The application of corrosive preventive material demands careful attention; compounds shall not be applied to surfaces which show signs of moisture, condensation frost, rust, loose mill scales, dirt of other contaminations .it is essential to ensure that articles are not handled until the film is set. Application may be dipping, brushing, spraying etc.
2.2.2Interleaving (for sheets and plates only)
Interleaving paper shall meet the minimum requirements of type 1 as per table 4 of the standard. The interleaving paper shall fully cover the metal, for manual application paper shall extend 25mm beyond sides and ends. For machine application, paper may be same size as metal, provided the metal is fully covered.
2.3PACKING
All Material must be properly packed in wooden crates or wooden boxes to avoid damage during handling, transportation and in transits products. Can be machining wrapped or hand wrapped.
2.3.1Packing for Sheets and Plates
2.3.1.1Products shall be wrapped with one layer of type-II A and two layers of type- III A barriers as stipulated in standard. Type of barrier shall be as per Table 4 of the standard.
2.3.1.2Wrapped products shall be encased in pallets with pallet enclosure designed as per clause No.:5.3.1.2 of MIL-STD-649C.Material for fabrication shall be as per table 5 of the standard.
2.3.2Packing for extrusion products
2.3.2.1Wooden boxes, corrugated fiberboard boxes or fibre tubes can be used for packing. Barrier shall be type II as per Table IV of the standard.
2.3.3Only one type, class or size of material shall be packed in one container.
2.4HANDLING
Containers and pallets in their shipping configuration shall be provided with lifting and hosting provisions commensurate with their weight, size and intended mode of transportation to ensure safe and efficient movement, as stipulated in the standard.
3.0RE-SAMPLING AND RE-TESTING
Failure of any specimen to conform to specified requirements shall causes material represented by such specimen to be subjected to rejection. However, the supplier may go for a retest and the disposition of the products may be base on the result of testing at least two specimens to replace each failed specimen from the original sample. Re-test specimens shall be selected randomly for sheets, plates and extrusion products; and for forgings retest specimens shall be taken as close as possible to the same location in the same forging or from a second forging from the same lot as was the original unacceptable specimen. All retest samples shall conform to specified requirements. if any retest specimen fails to meet the requirements, the material represented shall be rejected and no further testing permitted. Results of all tests shall be reported.
4.0INSPECTION
The manufacture shall afford the purchaser’s inspector all reasonable facilities necessary to satisfy him that the material is being produced and finished with the relevant speciation. All tests and inspection shall be made at the place of manufacture unless otherwise agreed to.
5.0CERTIFICATES AND REPORTS
5.1Manufacturer shall furnish the following certificates and test reports.
5.1.1Chemical analysis.
5.1.2Heat treatment report.
5.1.3Metallurgical analysis.
5.1.4Mechanical properties.
5.1.5Electrical conductivity test report for AA 7075 Alloy.
5.1.6Stress corrosion test report for AA 7075 Alloy.
5.1.7Ultrasonic inspection including the statement “Ultrasonically inspected in accordance with AMS standard 2630”
5.1.8Dimensional inspection report.
6.0REJECTION
6.1Any rejection based on tests made in accordance with this specification shall be reported to the manufacturer with in 60days from the receipt of material by purchaser at this site.
6.2Material that shows rejectable discontinuities prior to or subsequent to acceptance by the purchaser shall be subjected to rejection and manufacturer shall be notified for replacement.
FPD/MMD/28/15Annexure-II
TERMSCONDITIONS
1.1SCOPE OF WORK: Manufacture and supply of Aero space quality Aluminum Alloy B51S its equivalent AA 6351/IS: 64430 sheets in ‘O’ condition of any reputed manufacturers which should be as per the specification document Nos.: VSSC: FPD: 6351:O-2013 and VSSC: FPD: GEN.-1:2013.
1.2PACKING CONDITION MUST BE MET: The sheets should be properly packed after applying protective coatings/coverings in easily handling masses to avoid damages in handling/transits with the details of its contents put inside the packing and also pasted or written on it before despatch. All sheets must be properly packed in wooden crates or wooden boxes to avoid damage during handling, transportation and in transits.