克莱斯勒汽车材料标准-英文版

Chrysler Group LLC Document Number: MS-10373<S> Material Standard Date Published: 2010-11-10 Category Code: B-4 Change Level: L EASL Requirement: Yes
Restricted: No
DUCTILE CAST IRON
1.0 GENERAL
1.1 Purpose of the Standard
This standard describes the requirements for ductile (nodular) irons used in either the as-cast or heat treated condition. Grades A and AA are ferritic grades that are used in high ductility and impact resistant applications. Grades B, BH and BN are pearlitic grades and BQT is a martensitic grade used in high strength applications. This standard does not cover the requirements for austempered ductile iron (MS-7959).
1.2 Purpose of the Material
FERRITIC grades of ductile iron are used in high ductility and impact resistant applications such as suspension components. PEARLITIC grades of ductile iron are used in high strength applications such as crankshafts and brackets. MARTENSITIC grades are typically used for gears and can be produced to a wide range of properties; depending on the final hardness, this grade offers the highest wear resistance and the highest strength with corresponding reduced toughness and ductility.
1.3 Coverage of this Standard
This standard covers the chemical composition, mechanical properties, physical properties; microstructure and heat treat requirements for these materials.
1.4 Correlation to Other Standards
2.0 CHEMICAL COMPOSITION
The chemical compositions in Table 2 are only recommended ranges. The chemistry is secondary to hardness, microstructure, and mechanical properties.
3.0 PERFORMANCE REQUIREMENTS OF THE MATERIAL<S>
3.1 Mechanical Properties and Tests
The hardness ranges listed are typical for the mechanical properties listed for each grade.
The yield strength values listed are appropriate for section sizes up to 20mm. For larger section sizes refer to SAE J434.
Mechanical properties should be confirmed with test bars taken from the casting when practical based on casting design and geometry. Otherwise, separately cast test bars per ASTM-A536 are permissible upon agreement.
The location for measuring hardness will either be as shown on the drawing, or as agreed upon by the supplier, product engineering and the using facility.
3.2 Other Requirements
3.2.1 Microstructure
3.2.2 Heat Treatment
Parts cannot be salvage heat treated without approval of Product Engineering and Materials Engineering unless otherwise agreed upon; parts may require testing before approval will be given.
3.2.3 Ultrasonic Velocity
超声波
Designated safety parts require 100% ultrasonic velocity inspection as outlined in PS-5450.
All castings produced by the in-mold process require 100% ultrasonic velocity inspection as outlined in
PS-5450 until process reliability for nodularity control has been established and approved by the Cast Metals Lab.
The location for ultrasonic inspection will be designated on the part drawings.
射线检测
3.2.4 Radiographic Inspection***
Castings that require radiographic inspection must follow the guidelines of PS-1011. Safety critical cast components shall be radiographic inspected on an audit basis per CS-10460. The minimum requirements will include one casting per cavity per shift at the production foundry, or a frequency agreed upon by the supplier and the Cast Metals Lab. Discontinuity severity levels are rated in comparison to the reference radiographs of ASTM E-446. Acceptance/rejection criteria for internal soundness will be established during the development phase of the component and will be based on the nature and seriousness of the indications and their location within the casting. Unless otherwise agreed upon or specified on the drawing, the acceptance criteria defaults to Level 2 per ASTM E-446. Areas of the casting that are deemed critical or require better than Level 2 shall be reflected on the part drawings, otherwise the whole part is assumed to meet Level 2. Changes in the pattern, molding or casting that may alter the internal soundness of the part require evaluation by radiographic inspection.
3.2.5 Materials Engineering Guidelines for Approval and Continuing Conformance of Cast Components Refer to CS-10460 for guidelines to approval and continuing conformance of cast components.
3.2.6 Safety Parts
When PF-SAFETY<S> is listed in the CATIA Model or part drawing, the requirements of PF-SAFETY<S> and EM-10003<S> must be satisfied. For ductile iron castings the Primary Measurement requirement of EM-10003<S> shall be 100% nodularity inspection per 3.2.3 and the Secondary Measurement shall include hardness, microstructure and tensile testing to maintain lot control.
4.0 MATERIAL CHARACTERISTICS
The following properties are not intended as material requirements. The properties are listed as typical
properties to aid in the design of ductile iron castings.
4.1 Poisson's Ratio
The generally accepted value is 0.275 for most ductile irons.
4.2 Modulus of Elasticity
A commonly used value for all grades of ductile iron is 165 GPa (24 X 10exp6 psi).
5.0 QUALITY
Refer to CS-9801 for general quality requirements.
5.1 Part Validation Standards
Part Validation Standards, which are described in CS-11171, are required for all critical components and encouraged for all non-critical components. Critical components are described and listed in CS-10460, which also provides test requirement guidelines for critical and non-critical cast components.
6.0 DEFINITIONS/ABBREVIATIONS/ACRONYMS
PVS: Part Validation Standard
7.0 GENERAL INFORMATION
T hree asterisks “***” after the section/paragraph header denotes single or multiple technical changes to the section/paragraph. Specific technical changes within a section, subsection, table, or figure may be highlighted in yellow.
Certain important information relative to this standard has been included in separate standards. To
assure the processes submitted meet all of Chrysler requirements, it is mandatory that the requirements in the following standards be met.
CS-9800 - Application of this standard, the subscription service, and approved sources CS-9003 - Regulated substances and recyclability
Within Engineering Standards, the Regulatory (Government-mandated) requirements are designated by <S> and <E> which correspond to Safety and Emission Shields respectively. When applicable, the
Chrysler mandated requirements are designated by <D> which correspond to the Diamond symbol and by <A> for Appearance related objectives, respectively.
For specific information on this document, please refer to the contact person shown in the "Publication Information" Section of this document. For general information on obtaining Engineering Standards and Laboratory Procedures, see CS-9800 or contact the Engineering Standards Department at engstds@.
泊松比弹性模数
8.0 REFERENCES
9.0 ENGINEERING APPROVED SOURCE LIST***
10.0 PUBLICATION INFORMATION***
Contact/Phone Number: Philip Seaton / 248-576-6992
Alternate Contact/Phone Number: Lin Zhang /248-576-0235
Department Name & Department Number/Tech Club/Organization: Metallic Materials Engineering, Department 5810
Date Standard Originally Published: 2000-08-25
Date Published: 2010-11-10
Change Notice:
Description of Change:
- Modified paragraph 3.2.4 Radiographic Inspection to add default acceptance criteria.
- Updated EASL.
- Updated contact information.
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