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AMS 4902H
AEROSPACE MATERIAL
SPECIFICATION
Issued AUG 1955 Revid JUN 2006 Superding AMS 4902G
Titanium Sheet, Strip, and Plate消防安全大检查
Commercially-Pure
Annealed 40.0 ksi (276 MPa) Yield Strength
(Composition similar to UNS R50400)
RATIONALE
AMS 4902H is a Five Year Review and update of this specification. 1. SCOPE 1.1 Form
This specification covers one grade of commercially-pure titanium in the form of sheet, strip, and plate. 1.2 Application
This material typically has been ud for parts requiring aqueous corrosion resistance, moderate strength up to 400 °F (204 °C) and oxidation resistance up to 600 °F (316 °C), but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS
The issue of the following documents in effect on the date of the purcha order forms a part of this specification to the extent specified herein. The supplier may work to a subquent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superding document has been specified, the last published issue of that document shall apply. 2.1
SAE Publications
Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), or www.sae. AMS 2242 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium Alloy Sheet, Strip, and Plate AMS 2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS 2750 Pyrometry
曹睿
AMS 2809
Identification, Titanium and Titanium Alloy Wrought Products
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2.2
ASTM Publications
Available from ASTM International, 100 Barr Harbor Drive, P. O. Box C700, West Conshohocken, PA 19248-2959, Tel: 610-832-9585, or www.astm. ASTM E 8 Tension Testing of Metallic Materials ASTM E 112 Determining Average Grain Size ASTM E 290 Bend Testing Material for Ductility
ASTM E 384 Microindentation Hardness of Materials
ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique
明章之治
ASTM E 1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method
ASTM E 1941 Standard Test Method for Determination of Carbon in Refractory and Reactive Metals and Their Alloys
ASTM E 2371
Standard Test Method for Analysis of Titanium and Titanium Alloys by Atomic Emission Plasma Spectrometry
3. TECHNICAL REQUIREMENTS 3.1 Composition
Shall conform to the percentages by weight shown in Table 1; carbon shall be determined in accordance with ASTM E 1941, hydrogen in accordance with ASTM E 1447, oxygen and nitrogen in accordance with ASTM E 1409, and other elements in accordance with ASTM E 2371. Other analytical methods may be ud if acceptable to the purchar.
TABLE 1 - COMPOSITION
Element min max Iron Oxygen Carbon Nitrogen Hydrogen Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium -- -- -- -- -- -- -- remainder
0.30 0.20 0.08 0.05 0.0150 0.10 0.30 (500 ppm) (150 ppm) 3.1.1
Determination not required for routine acceptance.
3.1.2 Check Analysis
Composition variations shall meet the applicable requirements of AMS 2249. 3.2
Melting Practice
3.2.1 Alloy shall be produced by electron beam cold hearth or plasma arc cold hearth melting method, or shall be
multiple melted with the final melting cycle under vacuum. When multiple melted, the first melt shall be made using a vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The final melting shall be made under vacuum using vacuum arc remelting (VAR) with no alloy additions permitted. 3.2.1.1 The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury.
3.2.1.2
The electrode tip for nonconsumable electrode melting shall be water-cooled copper.
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3.3 Condition
The product shall be supplied in the following condition:
3.3.1 Sheet and Strip
Hot rolled with or without subquent cold reduction, annealed, descaled, and leveled, having a surface appearance comparable to a commercial corrosion-resistant steel No. 2D finish (See 8.2).
3.3.2 Plate
Hot rolled, annealed, descaled, and flattened, having a surface appearance comparable to a commercial corrosion-resistant steel No. 1 finish (e 8.2).
3.4 Annealing我们班
The product shall be annealed by heating to a temperature within the range 1200 to 1500 °F (649 to 816 °C), holding at
the lected temperature for a time commensurate with the thickness and the heating equipment and procedure ud,
and cooling at a rate which will produce product meeting the requirements of 3.5. Pyrometry shall be in accordance with
AMS 2750. Furnace uniformity shall be ± 25 °F (±14 °C).
3.5 Properties
The product shall conform to the following requirements:
3.5.1 Tensile
Properties
Shall be as shown in Table 2 on product 1.000 inch (25.40 mm) and under in nominal thickness, determined in accordance with ASTM E 8 with the rate of strain maintained at 0.003 to 0.007 inch/inch/minute (0.003 to 0.007
mm/mm/minute) through the yield strength and then incread so as to produce failure in approximately one additional minute. When a dispute occurs between purchar and vendor over the yield strength values, a referee test shall be performed on a machine having a strain rate pacer using a rate of 0.005 inch/inch/minute (0.005 mm/mm/minute) through
the yield strength and a minimum crosshead speed of 0.10 inch (2.5 mm) per minute above the yield strength.
TABLE 2 - TENSILE PROPERTIES
Property Value
Tensile Strength
Yield Strength at 0.2% Offt
Elongation in 2 Inches (50.8 mm) or 4D, minimum
50.0 ksi (345 MPa)
40.0 to 65 ksi (276 to 448 MPa) 20%
3.5.1.1 Elongation requirement applies only to product 0.025 inch (0.64 mm) and over in nominal thickness.
3.5.2 Bending
Product under 0.1875 inch (4.76 mm) in nominal thickness shall withstand, without evidence of cracking when examined at 20X magnification, bending in accordance with ASTM E 290 through an angle of 105 degrees around a diameter equal to the bend factor shown in Table 3 times the nominal
thickness of the product with the axis of bend parallel to the direction of rolling. In ca of dispute, results of bend tests using the end supported guided bend test procedure shall govern.
TABLE 3 - BEND FACTOR
Nominal Thickness
Inch Nominal Thickness
Millimeters
Bend
Factor
Up to 0.070, incl Over 0.070 to 0.1874, incl
Up to 1.78, incl
Over 1.78 to 4.76, incl
4
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3.5.3 Grain Size
Shall be 6 or finer, determined by comparison of a polished and etched specimen with the chart in ASTM E 112. 3.5.4 Surface Contamination
The product shall be free of any oxygen-rich layer, such as alpha ca, or other surface contamination, determined as in 3.5.4.1 or 3.5.4.2 or other method acceptable to purchar. 3.5.4.1
The bend test of 3.5.2.
3.5.
4.2 Hardness differential; a surface hardness more than 40 points higher than the subsurface hardness,
determined in accordance with ASTM E 384 on the Knoop scale using a 200-gram load, being evidence of unacceptable surface contamination. 3.6 Quality
The product, as received by purchar, shall be uniform in quality and condition, sound, and free from "oil cans" (e 8.3.1) of depth in excess of the flatness tolerances, ripples, and foreign materials and from imperfections detrimental to usage of the product. 3.7 Tolerances
Shall conform to all applicable requirements of AMS 2242. 4. QUALITY ASSURANCE PROVISIONS 4.1
Responsibility for Inspection
The vendor of the product shall supply all samples for vendor's tests and shall be responsible for the performance of all required tests. Purchar rerves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2
Classification of Tests
All technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.3
Sampling and Testing
Shall be in accordance with the following; a lot shall be all product of the same nominal size from the same heat procesd at the same time and annealed in the same heat treatment batch. 4.3.1 Composition
One sample from each heat, except that for hydrogen determinations one sample from each lot obtained after thermal and chemical processing is completed. 4.3.2
Tensile Property, Bending, Grain Size, and Surface Contamination Requirements
At least one sample from each lot. 4.3.2.1
Specimens for tensile tests of widths 9 inches (229 mm) and over shall be taken with specimen axis in both the longitudinal and long-transver directions; for widths under 9 inches (229 mm), specimens shall be taken with the specimen axis in the longitudinal directions.
4.3.2.2
For guided bend tests, specimen width shall be not less than 10 times the nominal thickness but not less than 1 inch (25 mm). For free bend tests, minimum specimen width shall, when possible, be not less than 10 times the nominal thickness; maximum width need not be greater than 1 inch (25 mm).
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4.4 Reports
The vendor of the product shall furnish with each shipment a report showing the results of tests for composition of each heat and for the hydrogen content, tensile, and bending properties, and grain size of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purcha order number, lot number, AMS 4902H, type, specific annealing treatment ud, size, and quantity.
4.5 Resampling and Retesting
If any specimen ud in the above tests fails to meet the specified requirements, disposition of the product may be bad on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cau for rejection of the product reprented. Results of all tests shall be reported.
5. PREPARATION FOR DELIVERY
5.1 Identification
Shall be in accordance with AMS 2809.
5.2 Packaging
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松鼠鱼的制作方法The product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the product to ensure carrier acceptance and safe delivery.
6. ACKNOWLEDGMENT
A vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purcha orders.
7. REJECTIONS
Product not conforming to this specification, or to modifications authorized by purchar, will be subject to rejection.
8. NOTES
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8.1 A change bar (l) located in the left margin is for the convenience of the ur in locating areas where technical
revisions, not editorial changes, have been made to the previous issue of this specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical revisions. Change bars and (R) are not ud in original publications, nor in specifications that contain editorial changes only.
8.2 Commercial corrosion-resistant steel finishes are defined in ASTM A 480/A 480M and AS4194.
8.3 Terms ud in AMS are clarified in ARP1917 and as follows:
8.3.1 "Oil
Can"
An excess of material in a localized area of a sheet that caus the sheet to buckle in that area. When the sheet is placed on a flat surface and hand pressure applied to the buckle, the buckle will spring through to the opposite surface or spring up in another area of the sheet.
8.4 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and
properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are prented only for information.
8.5 Purcha documents should specify not less than the following: AMS 4902H
Type of melting practice desired偷偷射
Form and size of product desired
Quantity of product desired.
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