1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 1 of 13 INTERNATIONAL TRUCK AND ENGINE CORPORATION NAVISTAR, INC. M
2、aterial, Parts, and Process Specifications (MPAPS) NUMBER: MPAPS- A-38 Former Designation: CEMS A-38 TITLE: Structural Steel Tubing CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: W. Cook APPROVED BY: R. Goluch SUPERSEDES: October 2001 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CU
3、RRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability
4、 of regulatory limits prior to use. Change Notice: MPAPS formatting, Editorial changes; Incorporated previously separate appendix 1.0 APPLICATION Structural steel tubing is used where highest strength at low cost is required. Structural tubing is produced in standard sizes, many of which correspond
5、to standard pipe outside diameters. ERW, butt welding and seamless manufacturing methods can be used to produce structural steel tubing. Corporate Engineering Materials Specifications covering other steel tubular products used by the Company are as follows: Mechanical Steel Tubing MPAPS A-10 Welded
6、and Seamless Steel Pipe MPAPS A-18 Fluid Line Steel Tubing MPAPS A-45 2.0 SCOPE This specification covers the requirements for structural steel tubing used in the Companys products. 2.1 Restricted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this specifi
7、cation must comply with the requirements of the MPAPS B-50 specification. 3.0 REFERENCE DOCUMENTS Unless otherwise specified, the latest issue of all referenced Standards will apply. The following Specifications, Standards, and Regulations are referenced in this specification and constitute a part o
8、f this specification to the extent specified herein:Quality System Standard ISO 9001 or TS-16949 CFR Title 29, Part 1910 NAVISTAR Manufacturing Std. MS-D-13 NAVISTAR Engineering Design Std A-16 NAVISTAR MPAPS B-50 ASTM A 500 ASTM A 618 ASTM A 751 NAVISTAR MPAPS A-10, Pt I ASTM E 208 API-5L ASTM A 37
9、0 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 7 4.0 REQUIREMENTS 4.1 Grade Classification Structural steel
10、 tubing is classified on the basis of yield strength. It is produced in ten grades, as shown in Table I. TABLE I GRADE CLASSIFICATION Designation Description * Section * Navistar Grade Obsolete International Grade Approximately Equivalent Specification XEW * - - High Strength Low Alloy Electric Resi
11、stance Welded Round, Square Rectangular XBW - ASTM A 618 High Strength Low Alloy Butt Welded MCS * - API 5L-X52 Medium Carbon Seamless or Electric Resistance Welded Round HMC * MCW LCW - EW - - - - Hot Formed Medium Carbon Electric Resistance Welded Medium Carbon Electric Resistance Welded Low Carbo
12、n Electric Resistance Welded Round, Square, Rectangular XHS - - High Strength Low Alloy Electric Resistance Welded or Seamless Hot Formed Structural Square, Rectangular CHS HHS ASTM A 500 Grade B Electric Resistance Welded or Seamless Cold Formed Structural RPA * - - Electric Resistance Welded or Se
13、amless with Required Low Temperature Impact Properties RPS * - - * For a more complete description of the grades, see “Appendix - General Information.” * Specific size availability for most grades is shown in MPAPS A-10, Part I, “Appendix - General Information.” * Most sizes in Grades XEW, MCS, HMC,
14、 XHS, RPA and RPS require minimum quantities. See “Appendix - General Information” for details. 4.2 Permissible Alternate When Grade RPA is specified on a drawing, it is permissible for manufacturing to use Grade RPS to allow for maximum freedom of selection at the manufacturing level. 4.3 Chemical
15、Composition Tubing purchased to this specification will meet the requirements for chemical composition shown in Table II. For reference analysis use ASTM A 751. NUMBER: MPAPS A-38 TITLE: Structural Steel Tubing CURRENT ISSUE DATE: June 2015 This document is restricted and may not be sent outside Nav
16、istar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 13 TABLE II CHEMICAL COMPOSITION Navistar Grade Chemical Composition, Percent (Max except where shown as min or range) Ca
17、rbon Manganese Phosphorus Sulfur Ladle Analysis Check Analysis Ladle Analysis Check Analysis Ladle Analysis Check Analysis Ladle Analysis Check Analysis XEW * 0.25 0.29 1.20 1.25 0.035 0.045 0.035 0.043 XBW * 0.25 0.29 1.20 1.25 0.035 0.045 0.035 0.043 MCS * 0.20-0.31 0.17-0.35 1.35 1.45 0.035 0.045
18、 0.035 0.043 HMC 0.35 0.39 1.20 1.25 0.035 0.045 0.035 0.043 MCW 0.35 0.39 1.35 1.40 0.035 0.045 0.035 0.043 LCW 0.15-0.23 0.12-0.27 0.30-0.90 0.26-0.94 0.035 0.045 0.035 0.043 XHS * 0.22 0.26 1.40 1.50 0.035 0.045 0.035 0.043 CHS 0.26 0.30 - - 0.035 0.045 0.035 0.043 RPA * RPS * 0.22 0.26 1.65 1.71
19、 0.035 0.045 0.035 0.043 * Treated with columbium, vanadium or both. * May be treated with columbium, vanadium or both. * Silicon 0.70% maximum ladle analysis. Steel will be fully killed and fine grain. May be treated with Cb, V, N or other alloying elements. 4.4 Mechanical Properties Structural tub
20、ing purchased to this specification will conform to the mechanical property requirements shown in Table III unless otherwise specified. See “Methods of Test,” Section 5. TABLE III TENSILE PROPERTIES Navistar Grade Wall Thickness incl Yield Strength, min (Unless Specified as Range) Tensile Strength,
21、min (Unless Specified as Range Elongation in 2 in (50 mm), percent, min Psi MPa psi MPa XEW All 50 000 345 70 000 483 18 XBW All 50 000 345 70 000 483 18 MCS(3) All 52 000 359 66 000 455 22 HMC All 46 000 317 58 000(1) 401(1) 23(2) MCW * All 50 000 345 75 000 517 20 LCW All 50 000 * 345 * 60 000 411
22、 17 XHS All 50 000 345 65 000 448 22 CHS All 46 000 * 317 * 58 000 401 23 RPA RPS All 50 000-78 000 345-538 70 000 483 20 * Grade MCW is annealed after welding of the seam by the producer. * Yield strength will be 40 000 psi (276 MPa), minimum, after arc welding or normalizing at 1650F (898C) and ai
23、r cooling. * Yield strength will be 36 000 psi (248 MPa), minimum, after arc welding or normalizing at 1650F (898C) and air cooling. (1) Minimum tensile strength for Grade HMC round tubing will be 52 000 psi (359 MPa). (2) Minimum elongation for wall thicknesses under 0.180 inch (4.57 mm) will be ca
24、lculated by the formula: elongation in 2 in = 61 t (inch) + 12 or elongation in 50 mm = 2.4 t (mm) + 12; where t = wall thickness. (3) The weld seam of electric resistance-welded pipe will be heat treated after welding or processed in such a manner that no untempered martensite remains, RC 35 max. N
25、UMBER: MPAPS A-38 TITLE: Structural Steel Tubing CURRENT ISSUE DATE: June 2015 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUN
26、E 2015 Page 4 of 13 4.5 Impact Test Requirements (Grades RPA And RPS Only) Grades RPA and RPS tubing purchased to this specification will meet the impact test requirements shown in Table IV unless otherwise specified. See “Methods of Test,” Section 5. 4.6 Charpy V-Notch The requirements for standard
27、 and subsize Charpy V-Notch specimens are shown in Table IV. The standard size specimen will be used except where the section thickness is less than 11 mm. In such cases, subsize specimens as listed will be used. The largest preferred size as shown in Table IV that the material thickness will permit
28、 should be selected. 4.7 Nil Ductility Transition Temperature - Alternate Method Grade RPS tubing will have a maximum nil ductility transition temperature (NDTT) of -30F (-34C). This requirement may be used in lieu of the Charpy V-Notch impact test for material with section thickness of 0.625 inch (
29、15.9 mm) and greater. See ”Methods of Test” in Section 5. TABLE IV CHARPY V-NOTCH IMPACT TEST REQUIREMENTS Type of Specimen Specimen Size, mm Test Temperature Impact Value, Minimum Grade RPA Grade RPS deg F Deg C ft lbf J ft lbf J Standard 10 x 10 -20 -29 8.0 11.0 20.0 27.1 Subsize 10 x 9 -20 -29 7.
30、5 10.0 19.0 25.8 Subsize 10 x 8 -20 -29 7.0 9.5 18.0 24.4 Subsize 10 x 7.5 -20 -29 7.0 9.5 17.0 23.0 Subsize 10 x 7 -20 -29 6.5 9.0 16.5 22.4 Subsize 10 x 6.7 -20 -29 6.5 8.5 16.0 21.7 Subsize 10 x 6 -20 -29 6.0 8.0 15.0 20.3 Subsize 10 x 5 -20 -29 5.5 7.5 13.0 17.6 Subsize 10 x 4 -20 -29 5.0 7.0 11
31、.0 14.9 Subsize 10 x 3.3 -20 -29 4.5 6.0 9.5 12.9 Subsize 10 x 3 -20 -29 4.0 5.5 7.0 9.5 9.5 4.8 Dimensional Tolerances Tubing purchased to this specification will conform to the requirements for dimensional tolerances shown in Tables V, VI, VII and VIII. See “Methods of Test,” Section 5. Structural
32、 tubing is specified to outside diameter and nominal wall thickness. TABLE V STRAIGHTNESS TOLERANCES International Grade Section Straightness Tolerance XEW XBW Round, Square, and Rectangular 0.062 inch in 3 feet 0.125 inch in 5 feet 1.57 mm in 0.91 m 3.18 mm in 1.52 m MCS Round 0.120 inch in 5 feet
33、3.05 mm in 1.52 m HMC Round Square, and Rectangular 0.062 inch in 3 feet 0.064 inch in 3 feet 1.57 mm in 0.91 m 1.63 mm in 0.91 m XHS, CHS, RPA, RPS Square, Rectangular 0.125 inch in 5 feet 3.18 mm in 1.52 m NUMBER: MPAPS A-38 TITLE: Structural Steel Tubing CURRENT ISSUE DATE: June 2015 This documen
34、t is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 5 of 13 TABLE VI TWIST TOLERANCES FOR SQUARE AND RECTANGULAR TUBING Navistar Gr
35、ade Major Dimension, in, incl Maximum Twist Per 3 Feet of Length, in Major Dimension, mm, incl Maximum Twist per 0.91 Meter of Length, mm XEW Tolerances will be as specified in MPAPS A-10, Part I. XBW, MCW, LCW Up to 1.5 Over 1.5 0.094 0.125 Up to 38 Over 38 2.39 3.18 HMC, XHS, CHS, RPA, RPS Up o 1.
36、5 Over 1.5 to 2.5 Over 2.5 to 4.0 Over 4.0 to 6.0 Over 6.0 to 8.0 Over 8.0 0.050 0.062 0.075 0.087 0.100 0.112 Up to 38 Over 38 to 63.5 Over 63.5 to 102 Over 102 to 152 Over 152 to 203 Over 203 1.27 1.57 1.90 2.21 2.54 2.84 TABLE VII SQUARE AND RECTANGULAR TUBING SIZE, WALL, WEIGHT AND LENGTH TOLERA
37、NCES Navistar Grade Distance Across Flats, incl Tolerances Plus or Minus Unless Otherwise Indicated Distance Across Flats Wall Thick- ness, Percent Allowable Variation from Nominal Weight Per Foot, Percent Cut Length in mm in mm in mm XEW Tolerances will conform to those shown in MPAPS A-10, Part I.
38、 XBW 1.00 to 1.500 Over 1.500 25.4 to 38.1 Over 38.1 0.031 0.062 0.79 1.57 10 - 0.125 3.18 MCW, LCW All All 0.031 0.79 10 - Up to 3 ft: 0.064 Over 12 ft: 0.125 Up to 0.91 m: 1.63 Over 0.91 to 3.66 m: 2.39 Over 3.66 m: 3.18 HMC Up to 63.5 Over 2.500 to 3.500 Over 3.500 to 5.500 Over 5.500 Up to 63.5
39、Over 6.5 to 88.9 Over 88.9 to 139.7 Over 139.7 0.020 * 0.025 * 0.030 * 1% * 0.51 * 0.64 * 0.76 * 1% * 10 - Up to 3 ft: 0.064 Over 3 to 12 ft: 0.094 Over 12 to 20 ft: 0.125 Over 20 to 30 ft: 0.188 Over 30 to 40 ft: 0.375 Up to 0.91 m: 1.63 Over 0.91 to 3.66 m: 2.39 Over 3.66 to 6.10 m: 3.18 Over 6.10
40、 to 9.14 m: 4.78 Over 9.14 to 12.19 m: 9.52 RPA, RPS * XHS All All 1% * 1% * - -4 Up to 22 ft: +0.50, -0.25 Over 22 to 44 ft: +0.75, -0.25 Up to 6.7 m: +12.7, -6.4 Over 6.7 to 14.4 m: +19.0, -6.4 * Tolerances include allowance for convexity or concavity. For rectangular sections, the tolerance calcu
41、lated for the larger flat dimension will also apply to the smaller flat dimension. This tolerance may be increased 50 percent when applied to the smaller dimension, if the ratio of cross-sectional dimensions is 1.5 thru 3.0, and 100 percent when the ratio exceeds 3.0. * Tolerances for Grade RPA and
42、RPS are optional as shown. * Tolerances for Grade CHS checked at least 2 inches from cut end of tube. NUMBER: MPAPS A-38 TITLE: Structural Steel Tubing CURRENT ISSUE DATE: June 2015 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate
43、 Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 6 of 13 4.8.1 Squareness Tolerances For Grades XHS, CHS, RPA and RPS square and rectangular tubing, adjacent sides may deviate from 90 degrees by plus or minus 2 degrees maximum. Square
44、ness tolerances for Grades HMC and XEW square and rectangular tubing will conform to those specified in MPAPS A-10, Part I. 4.8.2 Radii Of Corners The radius of any outside corner of Grades XHS, CHS, RPA and RPS square and rectangular tubing will not exceed three times the specified wall thickness.
45、Smaller corner radii such as two times wall thickness maximum may be obtained through negotiations with individual suppliers. Radii of corners for Grades HMC and XEW square and rectangular tubing will conform to those shown in MPAPS A-10, Part I. TABLE VIII ROUND TUBING SIZE, WALL AND LENGTH TOLERAN
46、CES Navistar Grade Outside Diameter, incl Tolerances, Plus or Minus Unless Otherwise Indicated Outside Diameter Wall Thickness Length in mm In mm in mm XEW 1.000 to 2.500 25.4 to 63.5 0.006 0.15 0.005 in (0.13 mm) 0.125 3.18 XBW 0.840 to 1.900 21.3 to 48.3 + 0.016, - 0.031 + 0.41, - 0.79 10% 0.125 3
47、.18 MCS 2.375 to 12.750 60.3 to 323.8 0.75% * 0.75% +15.0%-12.5% 0.125 3.18 HMC 1.250 to 2.500 2.501 to 3.000 3.001 to 3.500 3.501 to 4.000 4.001 to 5.000 5.001 to 6.000 31.8 to 63.5 63.6 to 76.2 76.3 to 88.9 89.0 to 101.6 101.7 to 127.0 127.1 to 152.4 0.006 0.008 0.009 0.010 0.015 0.020 0.15 0.20 0
48、.23 0.25 0.38 0.51 Tolerances shall be as specified for hot rolled tubing in MPAPS A-10, Part I. Up to 3 ft: 0.064 Over 3 to 12 ft: 0.094 Over 12 to 20 ft: 0.125 Over 20 to 30 ft: 0.188 Up to 0.91 m: 1.63 Over 0.91 to 3.66 m: 2.39 Over 3.66 to 6.10 m: 3.18 Over 6.10 to 9.14 m: 4.78 MCW, LCW Up to 1.500 Up to 38.1 + 0.015, - 0.000 + 0.38, - 0.00 10% Up to 3 ft: 0.064 Over 3 to 12 ft: 0.094 Over 12 ft: 0.125 Up
