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AMS 4946B
AEROSPACE MATERIAL
SPECIFICATION流星雨照片
Issued OCT 2002 Revid MAY 2006 Superding AMS 4946A
Titanium Alloy Tubing, Seamless, Hydraulic
3Al - 2.5V, Texture Controlled Cold Worked, Stress Relieved
(Composition similar to UNS R56320)
RATIONALE
AMS 4946B is a review and update including a revision to the upper limit for Contractile Strain Ratio. 1. SCOPE 1.1 Form
馒头学习This specification covers a titanium alloy in the form of amless tubing. 1.2 Application
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脑梗塞是什么原因引起This tubing has been ud typically for parts, such as hydraulic lines, requiring strength and oxidation resistance up to
600 °F (316 °C), and weldability, but usage is not limited to such applications. 1.3 Types
This specification covers the following types: 1.3.1
Type I - Tubing with 105 ksi (724 MPa) minimum yield strength
Type II - Tubing with 95 ksi (655 MPa) minimum yield strength Type III - Tubing with 70 ksi (433 MPa) minimum yield strength 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 2244 Tolerances, Titanium and Titanium Alloy Tubing
AMS 2249 Chemical Check Analysis Limits, Titanium and Titanium Alloy AMS 2634 Ultrasonic Inspection, Thin Wall Metal Tubing AMS 2750 Pyrometry
AMS 2809 Identification, Titanium and Titanium Alloy Wrought Products AMS-H-81200 Heat Treatment of Titanium and Titanium Alloys
AS4076 Contractile Strain Ratio Testing of Titanium Hydraulic Tubing AS33611
Tube Bend Radii
2.2 ASTM Publications
Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, or www.astm. ASTM E 8 Tension Testing of Metallic Materials
ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique
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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
2.3 ASME Publications
Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, or www.asme. ASME B46.1
Surface Texture
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
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Element min max Aluminum 2.50 3.50 Vanadium 2.00 3.00 Iron -- 0.30 Oxygen -- 0.12 Carbon -- 0.05 Nitrogen -- 0.020 (200 ppm)Hydrogen -- 0.015 (150 ppm)Yttrium (3.1.1) -- 0.005 ( 50 ppm)Other Elements, each (3.1.1) -- 0.10 Other Elements, total (3.1.1) -- 0.40
Titanium remainder
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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
Alloy shall be multiple melted; the final melting cycle shall be under vacuum. The first melt shall be made by vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subquent melt or melts shall be made under vacuum using vacuum arc remelting (VAR) practice with no alloy additions permitted.
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3.2.1 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. 3.2.2
The electrode tip for nonconsumable electrode melting shall be water-cooled copper.
3.3 Condition
Cold worked and stress relieved by heating to a temperature not lower than 700 °F (371 °C) and hol
瑞士留学ding at heat for not less than 30 minutes. Tubing which is rotary straightened after final reduction shall be stress relieved at a minimum temperature of 700 °F for not less than two hours after straightening.
3.3.1 Heat treating equipment shall conform to the requirements of AMS-H-81200. Furnaces shall meet the
requirements of AMS 2750 for Type A furnaces. Uniformity shall be between ±25 °F (±14 °C) with a readability requirement of ±2° (±1°). 3.4 Properties
Tubing shall conform to the following requirements: 3.4.1 Tensile Properties
Shall be as shown in Table 2, 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 cross head speed of 0.10 inch (2.5 mm) per minute above the yield strength.
TABLE 2 - TENSILE VALUES
Type Property Value
I Tensile Strength 125 to 142 ksi (862 to 979 MPa) Yield Strength at 0.2% Offt 105 ksi (724 MPa) Minimum Elongation in 2 Inches (50.4 mm) Nom. Dia. Up to 0.250 inch (6.35 mm), incl 10% Minimum Nom. Dia. Over 0.250 inch (6.35 mm) 14% Minimum II Tensile Strength 100 to 133 ksi (690 to 917 MPa) Yield Strength at 0.2% Offt 95 ksi (655 MPa) Minimum Elongation in 1 inch (6.35 mm) 13% Minimum III Tensile Strength 85 to 102 ksi (586 to 703 MPa) Yield Strength at 0.2% Offt 70 ksi (483 MPa) Minimum Elongation in 2 inches (50.8 mm) 15% Minimum
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3.4.2 Flarability
Specimens as in 4.3.3 shall withstand flaring at room temperature, without formation of cracks or other visible defects when examined at 10X magnification, by being forced axially, with a steady pressure, over a hardened and polished tapered steel pin having a 74-degree included angle to produce a flare having a permanent expanded OD not less than 1.20 times the original nominal OD f
or Types I and II, and not less than 1.30 times the original nominal OD for Type III. 3.4.3 Pressure Testing
Tubing shall show no bulges, leaks, pin holes, cracks, or other defects when subjected to an internal hydrostatic pressure (P) sufficient to cau a tensile stress equivalent to the minimum rated yield strength in the tubing wall, except that a diametric permanent t of 0.002 inch/inch (0.002 mm/mm) of diameter is acceptable. The hydrostatic pressure (P) shall
be determined from Equation 1:
where:
P = Test pressure in ksi (MPa)
S = Minimum Yield Strength in ksi (MPa) D = Nominal OD d = Nominal ID 3.4.4 Bending
Tubing shall not develop cracks, tears, breaks, or other flaws when bent 180 degrees around a suita
ble bend die having a centerline radius equal to three times the nominal OD of the tubing. A solid rotary ball-type retractable mandrel inrted to the tangent of the bend shall be ud to support the inside of the tube during bending to restrict flattening to a value that does not exceed 3% of the nominal OD of the tube. Flatness shall be measured in accordance with AS33611. 3.4.5 Flattening
The inside and outside surfaces of tubing shall show no cracks, tears, breaks, opened die marks, or opened polishing marks when a full ction of the tube (minimum 2 inches (51 mm) long) is flattened between parallel plates under a load applied gradually and perpendicularly to the longitudinal axis until the distance between the plates is not greater than the flattening factors shown in Table 3. After examination of the outside surfaces, the samples shall be split longitudinally and the inside surfaces examined. Examination of tube surfaces shall be at 5 to 10X magnification. Additional standards may be agreed upon by purchar and vendor for any tube sizes not listed in Table 3.
TABLE 3 - FLATTENING TEST-INCH/POUND UNITS
Nominal Tube Outer Diameter Inch Nominal
Tube Wall Thickness Inch Material Type Distance Between Plates Where
t = Actual Wall Thickness 0.250 0.016 Type I 12t 0.250 0.016 Type II 9t 0.250 0.018 Type I 10t 0.250 0.020 Type I 10t 0.250 0.022 Type II 8t 0.250 0.022 Type I 10t 0.250 0.028 Type I 9t 0.250 0.028 Type III 6t 0.313 0.020 Type I 12t 0.375 0.019 Type I 11t 0.375 0.020 Type I 13t 0.375 0.022 Type I 13t 0.375 0.028 Type I 10t
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TABLE 3 - FLATTENING TEST-INCH/POUND UNITS (CONTINUED)
Nominal Tube Outer Diameter Inch Nominal
Tube Wall Thickness Inch Material Type Distance Between Plates Where
t = Actual Wall Thickness 0.375 0.032 Type I 9t 0.375 0.038 Type I 9t 0.375 0.042 Type I 8t 0.500 0.020 Type I 14t 0.500 0.022 Type I 14t 0.500 0.026 Type I 13t 0.500 0.035 Type I 10t 0.500 0.042 Type I 9t 0.500 0.043 Type I 9t 0.500 0.051 Type I 8t 0.500 0.056 Type I 8t 0.625 0.020 Type I 16t 0.625 0.023 Type I 15t 0.625 0.027 Type I 14t 0.625 0.032 Type I 13t 0.625 0.035 Type I 12t 0.625 0.044 Type I 10t 0.625 0.052 Type I 9t 0.625 0.054 Type I 9t 0.625 0.071 Type I 8t 0.750 0.020 Type I 17t 0.750 0.027 Type I 15t 0.750 0.039 Type I 12t 0.750 0.049 Type I 10t 0.750 0.052 Type I 10t 0.7
50 0.063 Type I 9t 0.750 0.065 Type I 9t 0.875 0.020 Type I 19t 0.875 0.032 Type I 14t 0.875 0.045 Type I 12t 0.875 0.050 Type I 11t 0.875 0.061 Type I 10t 1.000 0.020 Type I 20t 1.000 0.021 Type I 19t 1.000 0.028 Type I 17t 1.000 0.030 Type I 16t 1.000 0.035 Type I 15t 1.000 0.036 Type I 14t 1.000 0.051 Type I 12t 1.000 0.070 Type I 10t 1.000 0.088 Type I 9t 1.000 0.140 Type I 8t 1.250 0.026 Type I 19t 1.250 0.028 Type I 18t 1.250 0.045 Type I 14t 1.250 0.046 Type I 14t 1.250 0.065 Type I 12t 1.250 0.070 Type I 12t 1.250 0.087 Type I 11t 1.500 0.032 Type I 18t 1.500 0.049 Type I 15t 1.500 0.054 Type I 14t
