MATERIAL SPECIFICATION:- ALUMINIUM ALLOY AA6351 T6 /B51SWP FOR EXTRUSIONS(FLATS, SQUARES,RODS&EQUAL LEG ANGLES )
SLNO. / Thickness(mm) / Width (mm) / LENGTH / ORDER QTY.(Kg) / Remarks
FLATS
1 / 10 / 160 / 2000 / 300
2 / 20 / 40 / 2000 / 300
3 / 20 / 50 / 2000 / 300
4 / 20 / 200 / 2000 / 500
5 / 25 / 70 / 2000 / 500
6 / 25 / 100 / 2000 / 500
7 / 25.4 / 127 / 2000 / 500
8 / 30 / 50 / 2000 / 300
9 / 30 / 125 / 2000 / 600
10 / 35 / 70 / 2000 / 300
11 / 35 / 100 / 2000 / 500
12 / 35 / 125 / 2000 / 500
13 / 35 / 330 / 2000 / 500
14 / 36 / 60 / 2000 / 500
15 / 43 / 61 / 2000 / 300
16 / 65 / 130 / 1000 / 300
17 / 80 / 100 / 1000 / 500
18 / 95 / 115 / 1000 / 600
19 / 65 / 315 / 1000 / 600
20 / 135 / 170 / 1000 / 620
SQUARES
21 / 35 / 35 / 2000 / 800
22 / 63 / 63 / 2000 / 500
23 / 80 / 80 / 1000 / 300
24 / 300 / 300 / 750 / 1000
ROD/CIRCULAR SECTION
SLNO. / Diameter (mm) / LENGTH(mm) / ORDER QTY.(Kg) / Remarks
1 / Ø16 / 2000 / 500
EQUAL LEG ANGLES
SLNO. / Thickness(mm) / Width (mm) / LENGTH / ORDER QTY.(Kg) / Remarks
01 / 3.2 / 25.4X25.4 / 3200 / 300
02 / 6.35 / 50.8X50.8 / 3200 / 300
TOTAL= / 12720
FPD/MMD/32/15
FPD/MMD/32/15 Annexure-II
TERMSCONDITIONS
1Manufacture and supply of Aero space quality Aluminum Alloy B51SWP equivalent AA 6351/IS:64430/B.S:H30 Extrusions in T6/ T651 condition either Hindalco make cross section or equivalent cross sections of any reputed manufacturers which should be as per the specification document Nos: VSSC: FPD: 6351E-2015 and VSSC: FPD: GEN.-1:2015.
2VSSC reserves right to participate witness the quality control & inspection tests at the manufacturer’s plant/lab or at any other approved laboratories to our choice.
3Manufacturer of material/processing of material and all its tests as per standards mentioned in the documents shall be carried out in our presence.
4Our QC engineer(s) will carry out the pre-delivery inspection at your site prior to despactch.All supports with tools, instruments, etc. should be extended to them. Materials that are ready for inspection should be informed to us well in advance (at least one month before) with all its details& test certificates for arranging for pre delivery inspection.
5Manufacturer/supplier should offer the entire quantity of each item/material with same lot/batch for our inspection and we can’t accept any item/material for part inspection.
6Material samples shall be identified and selected by us and all test specimens shall be prepared in our presence as per the ASTM/Indian /other standards and the sampling plans mentioned in the document.
7All material tests as mentioned in the document have to be carried out completely at the expense of manufacturer/supplier in our presence either at manufacturer’s plant/site or at reliable /reputed Govt. approved testing centers/laboratories (list with address has to be submitted) of our choice. All the materials tests have to be done in our presence according to the ASTM/Indian and other standards mentioned in the specification document.
8Supplier must provide/submit the manufacturer’s Mills or original material test certificate, which should invariably contain the details of material specification/grade, size of material, manufacturer’s date/month & year of manufacturer,ultrasonic tests on slabs, batch no./order no/lot no./cast no/heat no./melt no.; chemical composition requirement and its analysis results, results of all mechanical tests /hardness tests/macro & micro-etch tests/ultrasonic test/dimensional inspection/heat treatment/metallurgical analysis/grain size tests etc. for each item/product.
9The manufacturer/supplier must submit the test certificates/reports for chemical analysis, mechanical tests, heat treatment including temperature, time, cycle followed temperature accuracy obtained from the furnace, furnace calibration, ultrasonic tests on slabs, dimensional inspection etc.in three copies as a bound document after conducting all the tests in our presence.
10Each and every piece of material inspected and accepted for dispatch & supply must bear our inspection engineer’s signature /initials/ identification marks.
11Extrusions belonging to same batch no. /lot no. /cast no/heat no./melt no only packed in strong wooden crates/boxes by tying with metal strips and writing the details on it.
12The extrusions should be properly packed in our presence 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, only after our inspection/acceptance and clearance of the items/materials for dispatch.
13The rate per Kg. Of material is inclusive of the cost of manufacture, cost of test specimen material, cost of cutting taking the samples, test specimen preparations, identifications of samples & test specimens, conducting all tests, issue of all material test reports/certificates, printing all the details of material on each piece of material, his ownthird party inspection etc.
14Manufacturer/supplier should dispatch the materials only after obtaining material dispatch clearance repot from the concerned.
15Manufacturer/supplier should supply the materials only in strong wooden crates/boxes to avoid any damages in handling/transportation/transits and the rate per Kg. must be inclusive wooden of crates/boxes, packing charges etc.
16Each packing should contain its gross weight, packing case/material weight, net weight and the details of the item/material legibly printed and pasted or written on it and also by putting the details of the items/materials packed in inside the packing.
17The Minimum Order Quantity (MOQ) If Any Should Be Clearly Mentioned In Your Quotation.
18The quantity tolerance, if any, can be allowed up to ±10%.it is applicable only for the mass/weight of the material and it is not applicable for the number of pieces of the item/extrusions.
19The material shouldbefreefromanywrapping/distortions/twists/bends/undulations/surfaceimperfections/scratches/ damage/ defects/ bad appearances etc.etc. And this must be ensured by the manufacturer/supplier till the items are delivered at our place.
20.From each lot, three tensile and chemical composition test specimens were drawn randomly and tested at NABL approved labs in presence of VSSC engineer.
21. 100% ultrasonic inspection at product level to be carried out as per AMS 2630 class A. A certification of ultrasonic testing at billet level as per AMS 2630 class B to be mentioned in the mill's certificate.
22. Minor changes in the size of extrusion, rods, squares & angles are to be mentioned in the vendor's quotation and the same will be approved before ordering.
FPD/MMD/32/15 Annexure-III
VSSC: FPD: 6351E -2015
SPECIFICATION FOR ALUMINIUM ALLOY AA6351 EXTRUDED BARS, RODS, TUBES AND PROFILES
1.0SCOPE
This specification covers the specific requirement for Aluminium Alloy AA6351 bars, rods, tubes & profiles in T6 or T651 temper conditions for non pressurised structural members. This specification is also applicable for the nearest equivalent designation B51S/ IS: 64430/ BS: H30.
2.0APPLICABLE DOCUMENTS
2.1The following standards from a part of this specification to the extent specified herein. The latest 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 Aluminium Alloys.
ASTM E 3 / : / Preparation of Metallographic Specimens.
ASTM E 10 / : / Brinell Hardness 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.
2.3Aerospace Material Specifications
AMS 2630 / : / Inspection, Ultrasonic Product over 0.5 inch (12.7mm) thick.AMS2632 / : / Inspection, Ultrasonic of thin Material 0.5 inch (12.7mm) and Under in Cross-Section Thickness.
AMS 2772 / : / Heat Treatment of Aluminium Alloy Raw Materials.
2.4British Standards
BS 4L 100 / : / Inspection, Testing and Acceptance of Wrought Aluminium and Aluminium alloys.3.0CHEMICAL COMPOSITION
3.1Chemistry shall conform to the following percentages by weight, determined in accordance with ASTM E 34 or E 607 or any method mutually agreed.
TABLE -1 : Chemical Composition
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
3.2.1Analysis shall be made on the finished product for each lot as per 3.2.2.
3.2.2Lot Definition
An inspection lot shall consist of an identifiable quantity of the material of the same mill form, alloy, heat, temper and size traceable to a heat treated lot and subjected to inspection at one time.
4.0SUPPLY CONDITION
4.1Extrusions shall be supplied in the following conditions asmentioned in the purchase order.
4.1.1T6 Temper: Solution heat treated and precipitation hardened.
5.1.2T651 Temper:Solution heat treated, stress relieved by controlled stretching to produce a permanent set of 1.5 to 3% and precipitation heat treated.
4.1.2.1Extrusions may receive minor straightening, after stretching, of an amount necessary to meet the tolerance requirements.
4.2Unless otherwise agreed and stated in the purchase order, multi hole dies shall not be used.
5.0HEAT TREATMENT
5.1Heat treatmentshall be carriedout in accordance with AMS 2772.
5.2Heat Treatment Furnace: Extrusions shall be heat treated in air chamber furnaces. Air chamber furnaces shall be electrically heated.
5.3Calibration: Heat treatment equipment is to be calibrated for ensuring uniform and correct temperature as per AMS 2772.
5.4Heat Treatment cycle
5.4.1Heat Treatment to T651 and T6 Tempers.
TABLE – 2 : Heat Treatment Cycle
Solution Heat Treatment / Precipitation Heat treatmentMetal Temperature
±5ºC (A) / Quench temperature,
ºC (B) / Metal Temperature
±5ºC / Time at Temperature,
Hours (C) / Temper
535 / 38 Max. / 177 / 8 / T651 (D)
A - Recommended soaking times shall be section 5.4.1.1
B - When material is quenched by total immersion in water, the water should be at room temperature and suitably cooled to remain below 43ºC during the quenching cycle.
C - Typical or nominal time at temperature.
D - Stress relived by controlled stretching to a permanent set of 1.5% to 3% in the solution heat treated condition followed by minor straightening, if required and precipitation heat treated.
5.4.1.1Minimum soaking time required for solution treatment
TABLE – 3 : Soaking Time
Thickness, mm (A) / Air furnace Min.(B) / Thickness, mm (A) / Air furnace Min.(B)Over / Incl. / Over / Incl.
0.5 / 0.8 / 25 / 76 / 89 / 240
0.8 / 1.6 / 30 / 89 / 102 / 270
1.6 / 2.3 / 35 / 102 / 115 / 300
2.3 / 3.2 / 40 / 115 / 128 / 330
3.2 / 6.4 / 50 / 128 / 141 / 360
6.4 / 12.7 / 60 / 141 / 154 / 390
12.7 / 25 / 90 / 154 / 167 / 420
25 / 38 / 120 / 167 / 180 / 450
38 / 51 / 150 / 180 / 193 / 480
51 / 64 / 180 / 193 / 206 / 510
64 / 76 / 210
A -The thickness is the minimum dimension of the heaviest section at the time of heat treatment.
C -Soaking time should be measured from the time all furnace control instruments indicate recovery to the minimum of the process range.
5.4.1.2Maximum Allowable Quench Delay Time (For immersion type quenching): Maximum allowable quench delay time is 15 sec.Quench delay time shall begin just after the furnace door is completely open and ends when the last corner of the load is immersed in the water.
5.4.1.3The heat treatment practice described in the above section is typical. Optimum heat treatment cycle to achieve the property requirements of this specification shall be generated by the supplier with mutual agreement before processing.
6.0MECHANICAL PROPERTIES
6.1Tensile Properties
6.1.1The extruded products shall conform to the requirement for tensile properties in longitudinal direction as specified in table 4.
TABLE – 4 :Tensile Properties
Nominal thickness, mm / Tensile Strength MPa (min.) / Yield Strength at 0.2% offset MPa (min.) / Elongation in 50 mm or 4D % (min)Over / Incl
T6 Temper
--- / 6 / 300 / 255 / 8
6 / --- / 300 / 255 / 10
T651 Temper
--- / 6 / 290 / 245 / 8
6 / --- / 290 / 245 / 8
6.1.2Sampling for tensile properties: Three specimens shall be selected in longitudinal direction for each lot as per 3.2.2.
6.1.2.1Geometry of test specimens and the location in the product from which they are taken shall be as specified in ASTM B 557M unless otherwise specified by the purchaser.
6.1.3The tension test shall be made in accordance with ASTM B 557M.
7.0HARDNESS TEST
7.2.1The hardness shall be checked in accordance with ASTM E 10.
7.2.2The hardness values shall not be lower than 80HB/10/500 or 85HB/ 10/1000. However, the product shall not be rejected on the basis of hardness if the applicable tensile property requirements as per Table 4 are met.
8.0QUALITY
8.1Extruded products as received by the purchaser shall be uniform in quality, free from foreign materials and from internal and external imperfections detrimental to usage of the extrusions.
8.2Ultrasonic Inspection
8.2.1Input Billets: All billets used for extruding rods, bars, tubes & profiles shall be subjected to 100% ultrasonic inspection in accordance with AMS 2630 to detect small internal discontinuities. Materials shall be free from internal defects such as cracks, voids, laminations, stringers and other structural discontinuities which may or may not be exposed to the surface. Acceptance level shall be QUALITY CLASS A(single defect dia. 2.0 mm FBH and multiple/ linear defects dia 1.2 mm FBH) for billets used for realizing bars, rods, tubes and profiles.
8.2.2Products
8.2.2.1For bars & rods, 100% ultrasonic inspection shall be done in accordance with AMS 2630 to detect small internal discontinuities. Materials shall be free from internal defects such as cracks, voids and laminations. Acceptance level shall be QUALITY CLASS A(single defect dia. 2.0 mm FBH and multiple/ linear defects dia 1.2 mm FBH).
8.2.2.2For tubes, ultrasonic inspection shall be done in accordance with AMS 2630 to detect small internal discontinuities. Materials shall be free from internal defects such as cracks, voids and laminations. Acceptance level shall be QUALITY CLASS A(single defect dia. 2.0 mm FBH and multiple/ linear defects dia 1.2 mm FBH for national beam inspection or single defect G Notch – size (mm) : 1.3D x 2.5 L and multiple defects F Notch – size (mm) : 0.8D x 1.3L for angle beam inspection).
8.2.2.3For profiles, 100% ultrasonic inspection shall be done only at billet stage as per AMS 2630 and the acceptance level shall be QUALITY CLASS A(single defect dia. 2.0 mm FBH and multiple/ linear defects dia 1.2 mm FBH).
8.2.3All NDE tests shall be carried by personal qualified for ISNT/ ASNT Level- II (minimum) or personnel approved by VSSC.
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 keller’s reagent to reveal evidence of eutectic melting.
9.2.2There shall be no eutectic melting and no evidence of high temperature oxidation.
9.3Samples for Metallurgical Analysis shall be taken from each lot as 3.2.2. One specimen shall be taken for metallographic examination and one specimen for eutectic melting and high-temperature oxidation test in the event of different items (varied cross section) 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 300µm.
9.5Product Macro-Etch Test: Macro etching shall be done in accordance with ASTM E 340 on the cross section of at least one sample of an extruded log representing per heat, per extrusion campaign to ascertain the extent of peripheral grain growth (PGG). Peripheral grain growth shall not be more than 5 % or 5 mm (whichever is higher) on each side.
10.0DIMENSIONAL TOLERANCES
10.1Unless otherwise specified, Tolerances shall conform to all applicable requirements of BS 4L100.
11.0IDENTIFICATION MARKING
Supplier’s Name, Alloy, Size, RMC number, Heat number & Heat treatment batch number shall be punched on each piece. In case of thin sections (Tubes/ Profiles), the identification marking shall be stencilled.
12.0COLOUR CODING
For easy identification, colour coding shall be done on all Aluminium Alloy rods and bars. The base colour shall be applied on the full cross section of the product and the first colour band shall be painted as a band over the base colour. Wherever the cross section involved is very large, it is permissible to paint the base colour as a wide band. The base colour shall be wider; the first band shall be narrower. The wider band shall be approximately equal to twice the narrower band. The details are as follows.
TABLE – 5 : Colour coding
Temper Condition / Base Colour (AA6061) / First Colour Band / Colour CodeT6/ T651 / Red / Blue / Base Colour(Red at centre)
First Colour Band(Blue in left& right cells)
12.0PRESERVATION AND PACKING
13.1Cleaning: All Aluminium alloy extrusion shall be cleaned thoroughly by non corrosive solvent like acetone to remove any loose particles, oil, grease, dirt or corrosion.
13.2Preservation: All Aluminium alloy extrusion shall be applied with two coats of “LANOLIN” preservative coating (or equivalent coating mutually agreed) all over the surface.
13.3Packing: Extrusion shall be packed in wooden containers with sufficient supports to avoid damage during transit and handling. Only one type, class or size of material shall be packed in one container.
14.0RE-SAMPLING AND RETESTING
Failure of any specimen to conform to specified requirement shall cause material represented by such specimens to be subject to rejection. However, the supplier may go for a retest and the disposition of the products may be based on the result of testing at least two specimens to replace each failed specimen from the original sample. Retest specimens shall be selected randomly. 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 is permitted. Result of all tests shall be reported.
15.0INSPECTION
The Manufacturer shall afford the purchaser’s inspector all reasonable facilities necessary to satisfy him that the material is being produced and furnished with this specification. All tests and inspection shall be made at the place of manufacturer unless otherwise agreed to.
16.0CERTIFICATES AND REPORTS
Manufacturer shall furnish the following certificates and test reports.
a)Product Chemical Analysis
b)Heat Treatment Report
c)Metallurgical Analysis
d)Mechanical test report
e)Ultrasonic Inspection Report
f)Dimensional Inspection Report
17.0REJECTION
17.1Any rejection based on tests made in accordance with this specification shall be reports to the manufacturer within 60 days from the receipt of material by purchaser at his site.
17.2Material 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/32/15 Annexure-IV
VSSC: FPD: GEN-1:2015
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.