Designation:A512–96(Reapproved2001)
Standard Specification for
Cold-Drawn Buttweld Carbon Steel Mechanical Tubing1
This standard is issued under thefixed designation A512;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1.Scope
1.1This specification covers cold-drawn buttweld carbon steel tubes for use as mechanical tubing.
1.2This specification covers round,square,rectangular,and special shape mechanical tubing.
1.3Round tube size ranges covered are outside diameters up to31⁄2in.(88.9mm)and wall thickness from0.035to0.500in.
(0.89to12.70mm).
1.4Optional supplementary requirements are provided and, when desired,shall be so stated in the order.
1.5The values stated in inch-pound units are to be regarded as the standard.The values given in parentheses are for information only.
2.Referenced Documents
2.1ASTM Standards:
A370Test Methods and Definitions for Mechanical Testing of Steel Products2
E59Practice for Sampling Steel and Iron for Determination of Chemical Composition3
2.2Military Standards:
MIL-STD-129Marking for Shipment and Storage4
MIL-STD-163Steel Mill Products Preparation for Ship-ment and Storage4
2.3Federal Standard:
Fed.Std.No.123Marking for Shipments(Civil Agencies)4
3.Ordering Information
3.1Orders for material under this specification should include the following,as required,to describe the required material adequately:
3.1.1Quantity(feet,weight(Note1),or number of lengths),
N OTE1—The term“weight”is temporarily used in this specification because of established trade usage.The word is used to mean both“force”and“mass,”and care must be taken to determine which is meant in each case(SI unit for force=newton and for mass=kilogram).
3.1.2Name of material(buttweld carbon steel mechanical tubing),
3.1.3Form(round,square,rectangular,special shape), 3.1.4Condition,description and code letters(Section5), 3.1.5Grade,if required(Section6),
3.1.6Dimensions(round,Section9or square and rectangu-lar,Section10),
3.1.7Length(round length,9.2;square and rectangular length,10.5),
3.1.8Burr removal(Section11),
3.1.9Report of chemical analysis and products analysis,if required,
3.1.10Individual supplementary requirements if required (S1through S5),
3.1.11Special requirements,
3.1.12End use,
3.1.13Specification designation,
3.1.14Special marking(Section15),and
3.1.15Special packaging(Section16).
4.Materials and Manufacture
4.1The steel shall be made by any process.
4.2If a specific type of melting is required by the purchaser, it shall be as stated on the purchase order.
4.3The primary melting may incorporate separate degas-sing or refining,and may be followed by secondary melting, such as electroslag or vacuum-arc remelting.If secondary melting is employed,the heat shall be defined as all of the ingots remelted from a single primary heat.
4.4Steel may be cast in ingots or may be strand cast.When steel of different grades is sequentially st
rand cast,identifica-tion of the resultant transition material is required.The producer shall remove the transition material by an established procedure that positively separates the grades.
4.5Tubes shall be made by the furnace buttweld process.
4.6Tubes shall be coldfinished,either externally only (sunk)or externally and internally(mandrel drawn).
1This specification is under the jurisdiction of ASTM Committee A01on Steel,
Stainless Steel,and Related Alloys,and is the direct responsibility of Subcommittee
A01.09on Carbon Steel Tubular Products.
Current edition approved Oct.10,1996.Published November1997.Originally
published as A512–64.Last previous edition A512–95.
2Annual Book of ASTM Standards,V ol01.03.
3Annual Book of ASTM Standards,V ol03.05.
4Available from Standardization Documents Order Desk,Bldg.4Section D,700
Robbins Ave.,Philadelphia,PA19111-5094,Attn:NPODS.
1
四个计划
Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.
5.Condition
5.1The purchaser shall specify in the order one of the following conditions:
MD(Mandrel Drawn)—Nofinal thermal treatment
SD(Sink Drawn)—Nofinal thermal treatment
MDSR—Mandrel Drawn and Stress Relieved
SDSR—Sink Drawn and Stress Relieved
MDSA—Mandrel Drawn and Soft Annealed or normalized SDSA—Sink Drawn and Soft Annealed or normalized
NORM-MD-SR—Normalized,Mandrel Drawn,and Stress Relieved
NORM-SD-SR—Normalized,Sink Drawn,and Stress Re-lieved
6.Chemical Composition
6.1The steel shall conform to the requirements as to chemical composition prescribed in Table1or Table2and Table3.
6.2When a grade is ordered under this specification,sup-plying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade in Table1or Table2is not permitted.
7.Heat Analysis
7.1An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the ele-ments specified;if secondary melting processes are used,the heat analysis sh
all be obtained from one remelted ingot or the product of one remelted ingot of each primary melt.The heat analysis shall conform to the requirements specified,except that where the heat identity has not been maintained or where the analysis is not sufficiently complete to permit conformance to be determined,the chemical composition determined from a
product analysis made by the tubular manufacturer shall conform to the requirements specified for heat analysis.When requested in the order or contract,a report of such analyses shall be furnished to the purchaser.
7.2A report of this analysis shall be furnished only when requested on the order.
8.Product Analysis
8.1When requested on the purchase order,a product analy-sis shall be made by the manufacturer.The chemical compo-sition thus determined shall conform to the requirements prescribed in Table1or Table2as modified by Table3.
8.2The product analysis limits shown for carbon are not normally applicable to the MT grades.
8.3The number and source of samples for such product analysis shall be based on the individual he
at or lot identity of one of the following forms of material.
8.3.1Heat Identity Maintained—One product analysis per heat on either a billet,a length offlat rolled stock,or a tube.
8.3.2Heat Identity Not Maintained—One product analysis from one tube per2000ft(610m)or less for sizes over3in.
(76.2mm),or one product analysis from one tube per5000ft (1524m)or less for sizes under3in.(76.2mm).
8.4If the original test for product analysis fails,retests of2 additional billets,2lengths offlat rolled stock,or2tubes shall be made.Both retests for the elements in question shall meet the requirements of this specification;otherwise all remaining material in the heat or lot shall be rejected,or at the option of the producer,each billet,length,flat rolled stock,or tube may be individually tested for acceptance.
8.5Samples for product analysis,except for spectrochemi-cal analysis,shall be taken in accordance with Practice E59, and the composition thus determined shall correspond to the requirements in applicable section or table.
9.Permissible Variations in Dimensions of Round Tubing 9.1Diameter and Wall Thickness:
TABLE1Chemical Requirements A
Grade Designation
Chemical Composition Limits,%
Carbon Manganese
Phospho-
rus,max
Sulfur,max
MT10100.05–0.150.30–0.600.040.045
MT10150.10–0.200.30–0.600.040.045
MT X10150.10–0.200.60–0.900.040.045
MT10200.15–0.250.30–0.600.040.045
MT X10200.15–0.250.70–1.000.040.045
A Rimmed or capped steels which may be used for the above grades are characterized by a lack of uniformity in their chemical composition,and for this reason product analysis is not technologically appropriate unless misapplication is clearly indicated.
TABLE2Chemical Requirements for Other Carbon Grades A Grade
Desig-
nation B
Chemical Composition Limits,%
Carbon Manganese
Phospho-
rus,max
Sulfur,max
10080.10max0.50max0.0400.045
10100.08–0.130.30–0.600.0400.045
10120.10–0.150.30–0.600.0400.045
10150.12–0.180.30–0.600.0400.045
10160.12–0.180.60–0.900.0400.045
10180.14–0.200.60–0.900.0400.045
10190.14–0.200.70–1.000.0400.045
10200.17–0.230.30–0.600.0400.045
10210.17–0.230.60–0.900.0400.045
10250.22–0.280.30–0.600.0400.045
10260.22–0.280.60–0.900.0400.045
10300.27–0.340.60–0.900.0400.045
10350.31–0.380.60–0.900.0400.045
11100.08–0.150.30–0.600.0400.130C
11150.13–0.200.60–0.900.0400.130C
11170.14–0.20 1.00–1.300.0400.130C
A Rimmed or capped steels which may be used for the above grades are characterized by a lack of uniformity in their chemical composition,and for this reason product analysis is not technologically appropriate unless misapplication is clearly indicated.
B Other analyses are available.
C Grades1110,1115and1117shall contain0.08min%sulfur.
TABLE3Tolerances for Product Analysis for Steels Shown in
Table1
Element
Limit,or Maximum
of Specified
Range,%
Variation,Over Maximum Limit or
Under Minimum Limit
Under min,%Over max,%
Carbon To0.15,incl
0.02
0.03
0.03
0.04 Manganeses To0.60,incl
Over0.60
0.03
0.04
0.03
0.04 Phosphorus
Sulfur
...
...
.
..
...
0.01
0.01
9.1.1Variations in outside diameter,inside diameter,and wall thickness shall not exceed the amounts prescribed in Table 4.
9.1.2These variations apply to round,unannealed,and stress-relieved tubing.
9.1.3Diameter tolerance includes ovality.
9.1.4Sink tubing is normally ordered by outside diameter and nominal wall.Mandrel-drawn tubing is n
ormally ordered by outside diameter and inside diameter and may be ordered by outside diameter or inside diameter and wall thickness but not by all three dimensions.
9.2Length —Random lengths between acceptable limits will be furnished,utilizing the full mill length.Tubing will be cut in half if specified.Full length random tubing will have a spread not exceeding 7ft (2.1m).Half-length random tubing will have a spread not exceeding 4ft (1.2m).Not more than 10%of the total footage of a shipment may be furnished in lengths shorter than the minimum specified but not less than 6ft (1.8m).
9.2.1When specified,multiple lengths will be furnished and should include allowances made for the customer’s cutting tool width and grippage.Maximum and minimum lengths may be specified with the understanding that not more than 10%of the total footage in a shipment may be furnished in individual multiples cut to the customer’s specifications.
9.2.2Variations from the specified length shall not exceed the amounts prescribed in Table 5.9.3Straightness :
9.3.1A round tube shall be considered straight provided that no 3-ft (0.9-m)section departs from a straight line by more than 0.030in.(0.76mm).
9.3.2The straightness of round tubes shorter than 3ft (0.9m)shall be proportionate to 0.010in./ft (0.8mm/m).
9.3.3These straightness tolerances do not apply to soft-annealed tubing nor to long lengths of small diameter tubing.10.Permissible Variations in Dimensions of Square and
Rectangular Tubing
10.1Outside Dimensions and Wall Thickness —Variations in largest outside dimensions across flats and wall thickness shall not exceed the amounts prescribed in Table 6.
10.2Corner Radii —The corners of square and rectangular tubes shall be slightly rounded inside and slightly rounded outside consistent with wall thickness.The outside corners may be slightly flattened.The radii of corners for square and rectangular cold-finished buttweld tubes shall be in accordance with Table 7.Special radii may be obtained.
10.3Squareness Tolerance —Permissible variations for the side of square and rectangular tube shall be determined by the following equation:
6b 5c 30.006,in.~mm !
where:
b =tolerance for out-of-square,and
c =largest external dimensions across flats,in.(mm).The squareness of sides is commonly determine
d by on
e o
f the followin
g methods.
10.3.1A square,with two adjustable contact points on each arm,is placed on two sides.A fixed feeler gage is then used to measure the maximum distance between the free contact point and the surface of the tubing.
10.3.2A square,equipped with direct-reading vernier,may be used to determine the angular deviation which,in turn,may be related to distance to inches.
10.4Twist Tolerance —Variation in twist for square and rectangular tubing shall not exceed the amounts prescribed in Table 8.The twist in square and rectangular tubing may be measured by holding one end of the tubing on a surface plate
TABLE 4Diameter and Wall Thickness Tolerances for Round Tubing
Outside Diameter Range,in.(mm)
Outside Diameter,in.(mm)Inside Diameter,in.(mm)Wall Thickness,%Over
Under
Over
Under
Over
Under
Sunk
Up to 1⁄2(12.7),excl
0.004(0.15A 151⁄2to 11⁄2(12.7to 38.1),excl 0.005(0.10A 1011⁄2to 3(38.1to 76.2),incl
0.010(0.25)
......10A 10
Mandrel Drawn
Less than 0.156(3.96)wall:Up to 1⁄2(12.7),excl
1⁄2to 11⁄2(12.7to 38.1),excl 0.004(0.10)0.005(0.13)00000.010(0.25)0.005(0.13)B 121⁄210121⁄2100.156(3.96)wall and over:1⁄2to 11⁄2(12.7to 38.1),excl 0.005(0.13)000.005(0.13)B 77Under 0.156(3.96)wall:11⁄2(38.1)and over
0.010(0.0.010(0.25)10100.156(3.96)wall and over:11⁄2(38.1)and over
0.010(0.25)
0.010(0.25)
7
7
A Except at the weld line,where the weld pad may exceed this figure.
B
Tubes with an inside diameter under 1⁄2in.(12.7mm)may require more than 0.005in.(0.13mm)inside diameter tolerance and the producer should be consulted.
TABLE 5Permissible Variations in Length—Round Tubing
Lengths 4ft (1.2m)and under—up to 2in.(50.8mm)diameter
61⁄32in.(0.8mm)Lengths 4ft (1.2m)and under—over 2in.(50.8mm)diameter
63⁄64in.(1.2mm)Lengths 4ft to 10ft (1.2to 3.0m),incl—up to 2in.(50.8mm)diameter
63⁄64in.(1.2mm)Lengths 4ft to 10ft (1.2to 3.0m),incl—over 2in.(50.8mm)diameter
61⁄16in.(1.6mm)Lengths 10ft to 24ft (3.0to 7.3m),incl—all diameters
61⁄8in.(3.2mm)Lengths over 24ft (7.3m)—all diameters
61⁄8in.(3.2mm)A
A
Plus an additional tolerance of 61⁄16(1.6mm)for each 10ft (3.0m)or fraction over 24ft (7.3
m).
and noting the height of either corner of the opposite end of same side above the surface plate.Twist may also be measured by means of a beveled protractor equipped with a level.The angular deviation is measured on opposite ends or at any point throughout the length.
10.5Length —Random lengths between acceptable limits will be furnished,utilizing the full mill length.Tubing will be cut in half if specified.Full length random tubing will have a spread not exceedin
g 7ft (2.1m).Half-length random tubing will have a spread not exceeding 4ft (1.2m).Not more than 10%of the total footage of a shipment may be furnished in lengths shorter than the minimum specified,but not less than 6ft (1.8m).
10.5.1When specified,multiple lengths will be furnished and should include allowances made for the customer’s cutting
tool width and grippage.Maximum and minimum lengths may be specified with the understanding that not more than 10%of the total footage in a shipment may be furnished in individual multiples cut to the customer’s specifications.
10.5.2Variations from the specified length shall not exceed the amounts prescribed in Table 9.
10.6Straightness —The straightness tolerance for square and rectangular tubing shall be 1⁄16in.in 3ft (1:576).11.Workmanship,Finish,and Appearance
11.1Tubes shall have a surface finish compatible with the conditions (Section 5)to which the tubes are ordered.
11.2Special surface preparations as may be required for specific applications are not within the scop
e of this section.Such requirements shall be considered under the supplemen-tary or basis of purchase provisions of this specification,and details shall be provided in the purchase order.
11.3The tubing shall be free of injurious defects and shall have a workmanlike finish.Surface imperfections such as handling marks,straightening marks,light die marks,or shallow pits are not considered injurious.
11.4The tubing shall be free of scale.In the case of thermally treated tubing,a slight amount of color will not be considered cause for rejection.
11.5Saw cut tubes will be furnished without removing outside diameter and inside diameter burrs.
11.6Lathe cut tubes will be furnished with outside diameter burr only removed.
11.7Burr removal may be obtained by so specifying in the purchase order.
TABLE 6Outside Dimension and Wall Thickness Tolerances for Square and Rectangular Tubing
Largest Outside Dimension Across
Flats
Wall Thickness
Outside Dimension,Including Convexity or
Concavity饶文蔚
Wall Thickness Tolerance,6,%Over
Under
Sink A
Mandrel
Inch-Pound Units
in.in.in.in.To 3⁄4
over 0.0650.0100.01015121⁄2Over 3⁄4to 11⁄4under 0.1560.0150.0151010Over 3⁄4to 11⁄40.156and over 0.0150.015107Over 11⁄4to 21⁄2under 0.1560.0200.0201010Over 11⁄4to 21⁄2
0.156and over
0.0200.020
10
7
SI Units
mm
mm
mm mm To 19.0over 1.650.250.2515121⁄2Over 19.0to 31.8under 3.960.380.381010Over 19.0to 31.8 3.96and over 0.380.38107Over 31.8to 63.5under 3.960.510.511010Over 31.8to
63.5
3.96and over
0.51
0.51
10
7
A
Except at the weld line where the weld pad may exceed this figure.
TABLE 7Radii of Corners of Butt-Weld Square and Rectangular
Tubing
Wall Thickness,in.(mm)
Maximum Radii of Corners,in.(mm)A
0.065to 0.083(1.65to 2.11),incl
9⁄64(3.6)Over 0.083to 0.095(2.11to 2.41),incl 3⁄
16
(4.8)Over 0.095to 0.109(2.41to 2.76),incl 13⁄64(5.2)Over 0.109to 0.134(2.76to 3.40),incl 7⁄32(5.6)Over 0.134to 0.156(3.40to 3.96),incl 1⁄4(6.4)Over 0.156to 0.188(3.96to 4.78),incl 9⁄32(7.1)Over 0.188to 0.250(4.78to 6.35),incl 11⁄32(8.7)Over 0.250to 0.313(6.35to 7.95),incl 7⁄16(11.1)Over 0.313to 0.375(7.95to 9.52),incl 1⁄2(12.7)Over 0.375to 0.500(9.52to 12.70),incl
11⁄16(17.5)
A
These tolerances apply to grades MT 1010and MT 1015steel only.Toler-ances on other grades shall be established between the manufacturer and the purchaser.
TABLE 8Twist Tolerance,Square and Rectangular Mechanical
Tubing
Largest Dimension,in.(mm)
Twist Tolerance in 3ft,in.(in 1m,mm)
Under 1⁄2(12.7)
0.050(0.014)1⁄2to 11⁄2(12.7to 38.1),incl
0.075(0.020)Over 11⁄2to 21⁄2(38.1to 63.5),incl 0.095(0.026)Over 21⁄2(63.5)
0.125
(0.035)
TABLE 9Permissible Variation in Length—Square and
Rectangular Tubing
Lengths 3ft (0.9m)and under
61⁄16in.(1.,6mm)Lengths over 3to 12ft (0.9to 3.7m),incl 61⁄32in.(2.4mm)Lengths over 12to 20ft (3.7to 6.1m),incl 61⁄8in.(3.2mm)Lengths over 20to 30ft (6.1to 9.1m),incl 63⁄16in.(4.8mm)Lengths
over 30to 40ft (9.1to 12.2m),incl
美丽会
说话63⁄8in.(9.5
mm)
12.Machining Allowance—Round Tubing
12.1For the method of calculating the tube size required to clean up machining to a particular finished part,see Appendix X1.13.Coating
13.1Unless otherwise specified,the outside surface of the tubing shall be coated,before shipping,with a film of rust retarding oil.Unless otherwise specified,the inside surface of the tubing may also be coated with a film of rust retarding oil at the option of the manufacturer.When the order specifies that the tubing be shipped without rust retarding oil,the film of oils incidental to manufacturing will remain
on the surfaces.If the order specifies no oil,the purchaser assumes responsibility for rust in transit.14.Rejection
14.1Tubes that fail to meet the requirements of the speci-fication shall be set aside,and the manufacturer shall be notified.
15.Product Marking
15.1Civilian Procurement —Each box,bundle,lift,or,when individual pieces are shipped,each piece shall be identified by a tag or stencil with the manufacturer’s name or
brand,grade or material,purchaser’s order number,and this specification number (ASTM designation).
15.2Bar Coding —In addition to the requirements in 15.1and 15.3bar coding is acceptable as a supplemental identifi-cation method.The purchaser may specify in the order a specific bar coding system to be used.
动脉硬化指数
15.3Government Procurement —When specified in the con-tract or order,and for direct procurement by or direct shipment to the government,marking for shipment,in addition to requirements specified i
n the contract or order,shall be in accordance with MIL-STD-129for Military agencies and in accordance with Fed.Std.No.123for civil agencies.16.Packaging
16.1Civilian Procurement —The manufacturer,at his op-tion,will box,crate,carton,package in secured lifts,or bundle to ensure safe delivery.Special packaging requiring extra operations other than those normally used by the manufacturer must be specified on the order.
16.2Government Procurement —When specified in the con-tract or order,and for direct procurement by or direct shipment to the government when Level A is specified,preservation,packaging,and packing shall be in accordance with the Level A requirements of MIL-STD-163.
17.Keywords
17.1carbon steel tube;mechanical tubing;steel tube
SUPPLEMENTARY REQUIREMENTS
These requirements shall not be considered unless specified in the order,and the necessary tests shall be made at the mill.Mechanical property tests shall be performed in accordance with applicable portions of Test Methods and Definitions A 370.
S1.Hardness and Tension Tests—Round Tubing
S1.1When hardness is specified in the order,the tubing shall conform to the hardness limits specified in Table S1.1or Table S1.2,unless “Tensile Properties Required”is specified in the purchase order.When “Tensile Properties Required”is specified in the purchase order,the tubing shall conform to the tension test requirements and not necessarily the hardness limits shown in Table S1.1or Table S1.2.S1.2Number of Tests and Retests:
TABLE S1.1Tensile and Hardness Requirements for Stress Relief Annealed Round Tubes
Grade Tensile Strength,ksi (MPa)
(0.2%Offset)Yield Strength,min,ksi (MPa)Elongation 50mm,
min,%
Rockwell Hardness min max min max MT1010101163(434)65(448)100(689)100(689)58(400)59(407)1513B 70B 70B 90B 100MT1015101666(555)67(462)100(689)100(689)60(414)61(421)1413B 70B 70B 100B 100MT1017101867(462)68(469)100(689)100(689)62(427)62(427)1313B 72B 73B 100B 100MT102
071(490)130(896)65(448)11B 75C 20102572(496)130(896)67(462)11B 78C 20103080(552)130(896)70(483)10B 80C 20111063(434)100(689)58(400)15B 70B 1001115
68(469)
100
(689)
62(427)
13
B 70
B 100
TABLE S1.2Tensile and Hardness Requirements for Soft
Annealed Round Tubes
Grade
Tensile Strength,min,ksi (MPa)Yield Strength,min,ksi (MPa)Elongation 50mm,min,%
Rockwell Hardness MT101040(276)20(138)35B 40to B 65MT101543(296)25(172)34B 40min MT102050(345)30(207)32B 50min MT102555(379)35(241)32B 55min MT1030
40(276)
30
B 60
min
豫公网安备41160202000603
站长QQ:729038198
关于我们
投诉建议