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. 2017 by Navistar, Inc. JUNE 2017 Page 1 of 14 NAVISTAR, INC. Material, Parts, and Process Specifications
2、(MPAPS) NUMBER: MPAPS- A-2 Former Designation: CEMS A-2 TITLE: Cold Finished Steel Bars CURRENT REV No.: 1706 DATE: June 2017 WRITTEN/EDITED BY: W. Cook APPROVED BY: R. Goluch SUPERSEDES: 1506 June 2015 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification may invo
3、lve 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 of regulatory limits prior to use. Change
4、 Notice: Reformatted for MPAPS; Incorporated Appendix; Editorial Changes 1.0 APPLICATION Cold finished bars are free from scale, have closer dimensional tolerances, better machinability, and offer improved mechanical properties. They are also more expensive than hot rolled bar products. 2.0 SCOPE 2.
5、1 This specification covers requirements for general applications of carbon and alloy cold finished steel bars. Whenever applicable the specification should be used in conjunction with A-0, Part II, Navistar System of Steel Classification. Unless otherwise specified, the appropriate ASTM Specificati
6、ons shall apply to this specification. 2.2 Requirements for cold finished steel bars not included in this specification are in the following Corporate Engineering Materials Specifications: Wrought Corrosion and Heat Resisting Steel MPAPS A-37 HSLA Grade 50 or similar Materials MPAPS A-43 2.3 Restric
7、ted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this specification 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 shall apply. The follo
8、wing standards, specifications and regulations are referenced in this specification. Quality System Standard ISO 9001 or TS-16949 CFR Title 29, Part 1910 NAVISTAR Supplier Packing and Shipping Std. D-13 NAVISTAR Engineering Design Std. A-16 NAVISTAR MPAPS B-50 NAVISTAR MPAPS A-0, Part I NAVISTAR MPA
9、PS A-0, Part II NAVISTAR MPAPS A-43 ASTM A29 ASTM A370 ASTM A108 ASTM A311 ASTM A322 ASTM A400 ASTM A434 NUMBER: MPAPS A-2 TITLE Cold Finished Steel Bars CURRENT ISSUE DATE: June 2017 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corpora
10、te Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. JUNE 2017 Page 2 of 14 4.0 REQUIREMENTS Cold finished bars are classified by chemistry and identified by SAE/ASTM steel grade designation Material supplied shall meet the applicable requirements of
11、ASTM A29, ASTM A108, ASTM A311 and ASTM A322. 4.1 Chemical Composition 4.1.1 Bars purchased to this specification shall conform to the required analysis for the appropriate steel in MPAPS A-0, Part I, Chemical Composition of Standard Steels. 4.1.2 Steels with an “SR”, “SS” or “SSA” suffix shall have
12、 the same chemical composition as those without a suffix. 4145 SS and 4145 SSA shall meet the chemical composition requirements for SAE 4145, except the carbon content shall be 0.40-0.50 percent with lead, tin, or tellurium additions permissible. 4.1.3 The most readily available cold drawn steels ar
13、e 1018 and 1045. Effort should be made to standardize on these grades. 4.2 Mechanical Properties Mechanical properties for as cold drawn bars are not guaranteed, nor are those for turned and polished or turned, ground, and polished bars which have properties of hot rolled bars. See “Appendix - Gener
14、al Information.”. A useful guide for selecting appropriate bar stock and processing methods to achieve required properties is found in ASTM A400. Required tensile properties for cold drawn, stress relieved steel bars are shown in Table I. See “Methods of Test,” page 5, and “Appendix - General Inform
15、ation.” NUMBER: MPAPS A-2 TITLE Cold Finished Steel Bars CURRENT ISSUE DATE: June 2017 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. 2017 by Navistar,
16、Inc. JUNE 2017 Page 3 of 14 TABLE I MECHANICAL PROPERTY REQUIREMENTS - COLD DRAWN, STRESS RELIEVED STEEL BARS (Special Cold Drawn, High Tensile) Size, incl Steel Designation International Code MPAPS Part II Rounds, Squares Inches mm Yield strength, elongation 2 in (50.8 mm) psi MPa percent, min 0.37
17、5 to 2.000 9.52 to 50.80 1040 SR 2-421 90 000 621 10 1045 SR 100 000 689 10 1137 SR 90 000 621 11 1141 SR 100 000 689 11 1144 SR 100 000 689 10 1144 SS * no code 125 000 862 10(1) 1541 SS * 130 000 896 12(1) 4145 SS * 130 000 896 10(1) 4145 SSA * 165 000 1138 9(1) 1.000 to 2.500 25.40 to 63.50 Inter
18、national 50” SR no code 80 000(1) 552(1) 18(1) 2.001 to 2.500 50.82 to 63.50 1137 SR no code 90 000 621 11 1045 SR 2-422 100 000 689 10 1141 SR 100 000 689 11 1144 SR 100 000 689 10 1144 SS* no code 125 000 862 10(1) 4145 SS* 130 000 896 10(1) 4145 SSA* 65 000 1138 9(1) 2.501 to 3.000 63.52 to 76.20
19、 1137 SR no code 90 000 621 10 1045 SR 2-422 100 000 689 10 1141 SR 100 000 689 10 1144 SR 100 000 689 10 4145 SS* no code 130 000 896 10(1) 4145 SSA* 165 000 1138 9(1) 3.001 to 3.500 76.22 to 88.90 4145 SS* no code 130 000 896 10(1) 4145 SSA* 165 000 1138 9(1) 3.001 to 4.000 76.22 to 101.60 1045 SR
20、 2-422 90 000 621 9 1141 SR 90 000 621 9 1144 SR 90 000 621 9 * If cold drawn, stress relieved steel bars are ordered in 40 000 lb (18 Mg) minimum quantities, the yield strength shall be held to a maximum of 20 000 psi (138 MPa) over the specified minimum yield strength. * Special Steels. Additional
21、 minimum requirements. Steel Tensile Strength Hardness RC Psi MPa 1144 SS 140 000 965 30 1541 SS 150 000 1034 33 4145 SS 150 000 1034 32 4145 SSA 180 000 1241 38 In event of disagreement between hardness and tensile strength, the tensile strength shall govern. (1) Typical value; not a requirement. N
22、UMBER: MPAPS A-2 TITLE Cold Finished Steel Bars CURRENT ISSUE DATE: June 2017 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. 2017 by Navistar, Inc. JUNE
23、 2017 Page 4 of 14 4.3 Dimensional Tolerances Material purchased to this specification shall conform to the dimensional tolerances in ASTM A108 The diameter tolerances for round bars shown in Table II below and Table IV, page 4, are extracted for convenience. Tolerances for 1144 SS, 4145 SS, and 414
24、5 SSA cold drawn round bars shall be as shown in Table III. See “Appendix - General Information” for square, hexagon, and flat bar tolerances. TABLE II - ROUNDS COLD DRAWN AND TURNED AND POLISHED, DIAMETER TOLERANCES, MINUS Heat Treatments and Bar Diameter Carbon Steel Maximum of Carbon Range, Perce
25、nt, Incl 0.28 and under 0.29 to 0.55 over 0.55 to 0.55 over 0.55 all carbon ranges Alloy Steel Applicable Heat Treatments before cold finishing no heat treatment or anneal, spheroidize anneal, normalize no heat treatment or anneal, spheroidize anneal, normalize quench and temper or normalize and tem
26、per For alloy bar tolerances, increase the carbon bar tolerances of similar size, carbon range and heat treatment by 0.001 inch (0.03 mm) after cold finishing None stress relieve or anneal None Bar Diameter, inches, incl Cold Drawn or Turned and Polished, inch to 1.500 0.002 0.003 0.005 0.004 0.005
27、0.005 1.501 to 2.500 0.003 0.004 0.006 0.005 0.006 0.006 2.501 to 4.000 0.004 0.005 0.007 0.006 0.007 0.007 Turned and Polished Only, inch 4.001 to 6.000 0.005 0.006 0.008 0.007 0.008 0.008 6.001 to 8.000 0.006 0.007 0.009 0.008 0.009 0.009 8.001 to 9.000 0.007 0.008 0.010 0.009 0.010 0.010 9.001 an
28、d over 0.008 0.009 0.011 0.010 0.011 0.011 Bar Diameter, mm, incl Cold Drawn or Turned and Polished, mm to 38.10 0.05 0.08 0.13 0.10 0.13 0.13 38.12 to 63.50 0.08 0.10 0.15 0.13 0.15 0.15 63.52 to 101.60 0.10 0.13 0.18 0.5 0.18 0.18 Turned and Polished Only, inch 101.62 to 152.40 0.13 0.15 0.20 0.18
29、 0.20 0.20 152.42 to 203.20 0.15 0.18 0.23 0.20 0.23 0.23 203.22 to 228.60 0.18 0.20 0.25 0.23 0.25 0.25 228.62 and over 0.20 0.23 0.28 0.25 0.28 0.28 TABLE III - ROUNDS COLD DRAWN, 1144, 4145 SS AND 4145 SSA, DIAMETER TOLERANCES, MINUS Bar Diameter, incl 1144 SS 4145 SS TURNED, GROUND, AND POLISHED
30、, DIAMETER TOLERANCES, MINUS Bar Diameter incl Resulfurized Carbon Grades Unheat Treated Carbon and Alloy Grades Nonresulfurized Carbon Grades, Heat Treated Carbon and Alloy Grades* inches mm Inch mm Inch mm to 1.500 to 38.10 0.001 0.03 0.001 0.03 1.501 to 2.499 38.12 to 63.47 0.0015 0.04 0.0015 0.0
31、4 2.500 to 3.000 63.50 to 76.20 0.002 0.05 0.002 0.05 3.001 to 4.000 76.22 to 101.60 0.003 0.08 0.003 0.08 Turned, Ground and Polished Only 4.001 to 6.000 101.62 to 152.40 0.004 0.10 0.005 0.13 6.001 and over 152.42 and over 0.005 0.13 0.006 0.15 * For alloy grades, applies only to quench and temper
32、ed, normalized and tempered or any similar double treatment prior to turning. 5.0 QUALITY Material purchased to this specification shall be manufactured from special quality hot rolled bars, unless otherwise specified. The bars shall be commercially free from injurious defects and shall have a smoot
33、h bright surface consistent with the method of cold finishing. 5.1 Methods of Test Perform the tensile test according to ASTM A 370. 6.0 QUALIFICATION Engineering qualification of sources is required in advance of production shipments. Samples shall be accompanied by test data certifying that all re
34、quirements of the specification have been met. 6.1 Quality Control Plan A Quality Control Plan for products supplied to the requirements of this specification will be established by mutual agreement between NAVISTAR and the supplier. Unless specific exception is noted, the following characteristics,
35、 where applicable*, shall be included in the plan as features for management by statistical process control.* * Other characteristics for inclusion in the control plan may be specified on the engineering drawing and/or purchase order. * See NAVISTAR Engineering Design Standard A-16 7.0 SOURCE APPROV
36、AL AND QUALITY CONTROL 7.1 Supplier Requirements All suppliers to NAVISTAR are required to be registered to ISO 9001 Quality System Requirements. NAVISTAR will also accept TS-16949 registration as long as the supplier can also fulfill all AIAG PPAP (Production Part Approval Process) documentation an
37、d approval requirements. Suppliers must maintain their certification with an accredited registrar and must furnish copies of registration certificates to their Corporate Buyer upon request. NUMBER: MPAPS A-2 TITLE Cold Finished Steel Bars CURRENT ISSUE DATE: June 2017 This document is restricted and
38、 may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. JUNE 2017 Page 6 of 14 7.2 Approval Parts supplied against contracts or purchase orders citing this specification
39、 shall be equivalent in all respects to those samples which were approved by the purchaser. No changes in formulation or processing practices are permitted without approval. In the event that changes in material, properties, processing practices, construction, color, or labeling of the product are r
40、equired, the supplier shall notify NAVISTAR Materials Engineering and Purchasing and Supplier Development of the proposed change(s). Test data indicating conformance to all requirements of this specification, test samples, and new or amended or updated Material Safety Data Sheet(s) (MSDS), in accord
41、ance with CFR Title 29, Part 1910 shall be submitted with the request for change. 7.3 Process Control The supplier shall either perform and report results of tests on specific lots of parts produced using ISO 9001 or TS-16949 guidelines, or provide statistical evidence of the lot having been produce
42、d in a state of statistical control and with a process capable of providing all required properties. The part supplier and the quality control manager of the using NAVISTAR plant may determine testing and reporting requirements on specific products. 8.0 SHIPPING AND HANDLING Shipping and identificat
43、ion shall be in accordance with NAVISTAR Supplier Packing and Shipping Standard D-13. Parts shall be packaged so as to avoid any damage in shipment detrimental to the appearance of the part. 9.0 DESIGNATION ON DRAWINGS 9.1 Drawings In specifying cold finished steels on engineering drawings, it is de
44、sirable to allow as many options as possible at the manufacturing level and still insure proper engineering performance. A system of coding steels to accomplish these objectives was established and is covered in MPAPS A-0, Part II, International system of Steel Classification. It is recommended that
45、 this coding system be used whenever possible. See “Choice of Tables” in A-0, Part II. for critical parts where the freedom of a code cannot be permitted, a specific steel grade should be used. Ordinarily, no reference to A-2 is made on the drawing except for steels with special properties. Examples
46、 of drawing specifications for cold finished steels are as follows: 2-421, MPAPS A-0, Pt II 1045 SR, MPAPS A-2 2-400, MPAPS A-0, Pt II 1144 SS, MPAPS A-2 9.2 Purchase Orders Material designation on purchase orders should consist of one of the appropriate grades and any special requirements necessary for proper fabrication of the part. see “Appendix - General Information.” Examples: 1144 SR, MPAPS A-2 1117 CD, MPAPS A-2 1137 CD, G editorial changes R. Goluch 6/21/2017
