GB/T 9437-2009 PDF English
US$310.00 · In stock · Download in 9 secondsGB/T 9437-2009: Heat resistant iron castings Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 9437: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 9437-2009 | English | 310 |
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Heat resistant iron castings
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| GB/T 9437-1988 | English | 559 |
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Heat resistant iron castings
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GB/T 9437-2009: Heat resistant iron castings---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT9437-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.80
J 31
Replacing GB/T 9437-1988
Heat resistant iron castings
Issued on. APRIL 01, 2009
Implemented on. DECEMBER 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Technical requirements... 6
4 Test methods... 8
5 Acceptance rules... 11
6 Marks and quality certificates... 14
7 Rust prevention, packaging and storage... 14
8 Requirements of environmental protection, safety and laws and regulations... 14
Annex A (informative) High temperature short time tensile strength of heat resistant
cast iron... 16
Annex B (informative) Conditions of use and application examples of heat resistant cast
iron... 17
Annex C (informative) U-type single casting test block... 19
Annex D (informative) Test method for resistance to growth of heat resistant cast iron
... 21
Annex E (informative) Test method for anti-oxidation of heat resistant cast iron... 24
Annex F (informative) Test method for thermal expansion coefficient... 27
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules,
marks and quality certificates, anti-rust, packaging and storage requirements for heat
resistant iron castings.
This Standard is applicable to heat resistant iron castings cast in sand molds or molds
with similar thermal conductivity to sand molds and working at temperatures below
1100°C.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 223.3, Methods for chemical analysis of iron, steel and alloy - The diantipyryl
methane phosphomolybdate gravimetric method for the determination of
phosphorus content
GB/T 223.8, Methods for chemical analysis of iron, steel and alloy - The sodium
fluoride separation - EDTA titration method for the determination of aluminum
content
GB/T 223.11, Iron, steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method
GB/T 223.12, Methods for chemical analysis of iron, steel and alloy - The sodium
carbonate separation-diphenyl carbazide photometric method for the determination
of chromium content
3 Technical requirements
3.1 Designation and chemical composition of heat resistant cast iron
The designation method of heat resistant cast iron conforms to the provisions of GB/T
5612.There are 11 designations in total.
3.2 Geometric dimensions, machining allowances and weight tolerances
The geometric shape and size of the casting shall meet the requirements of the drawing.
Its dimensional tolerance and machining allowance shall comply with the provisions of
GB/T 6414.Its weight deviation shall comply with the provisions of GB/T 11351.
3.3 Surface quality
3.4 Mechanical properties
The mechanical properties of castings at room temperature shall meet the requirements
in Table 2.See Annex A for short-time high temperature tensile properties.
3.5 Heat treatment
Silicon-based and aluminum-based heat resistant ductile iron castings shall generally
undergo heat treatment to eliminate residual stress. However, when the silicon-
molybdenum heat resistant ductile iron castings have a pearlite content of less than 15%,
heat treatment is not required.
See Annex B for the service conditions of heat resistant cast iron.
3.6 Metallographic structure
For the metallographic structure of heat resistant cast iron, refer to the provisions of
GB/T 9441 and GB/T 7216.The specific requirements shall be negotiated by both
parties. For silicon-based heat resistant cast iron, the matrix structure shall be mainly
ferrite.
3.7 Anti-oxidation, anti-growth properties and thermal expansion coefficient
At the service temperature, the average oxidation weight gain rate of heat resistant cast
iron is not greater than 0.5g/m2·h; the growth rate is not greater than 0.2%.
3.8 Special requirements
When the purchaser has requirements for magnetic particle testing, ultrasonic testing,
ray testing, it shall be agreed between the supplier and the purchaser.
4 Test methods
4.1 Chemical composition analysis
4.1.1 Chemical composition analysis can be carried out by conventional chemical
analysis method or photoelectric direct reading spectroscopic analysis method.
4.1.2 Sampling methods for conventional chemical analysis shall be carried out in
accordance with the provisions of GB/T 20066.
4.2 Mechanical properties test
Cast iron designation Minimum tensile strength Rm/MPa Hardness / HBW
4.2.1 The room temperature mechanical property test of HTRCr, HTRCr2, HTRSi5 and
other designations, including the preparation of specimens, shall be carried out in
accordance with the provisions of GB/T 228.
4.3 Test blocks, specimens
4.3.1 The shape and size of the Y-shaped single-cast test block used in the tensile test
of QTRSi4, QTRSi5, QTRSi4Mo, QTRSi4Mo1, QTRAl4Si4, and QTRAl5Si5 are
shown in Figure 1 and Table 3 (the hatched line in Figure 1 is the position where the
specimen is cut). Generally, choose type II. The test blocks in Annex C can also be used.
The shape and size of single-cast easy-cut test blocks used by QTRA122 and HTRCr16
are shown in Figure 2.
4.4 Anti-oxidation and anti-growth test
Anti-oxidation and anti-growth tests of heat resistant cast iron shall be carried out in
accordance with the provisions of Annex D and Annex E.
4.5 Thermal expansion coefficient test
Refer to Annex F for the test method of thermal expansion coefficient.
4.6 Heat treatment
In addition to eliminating the internal stress of the casting, if the casting is subjected to
other heat treatments, the test block shall also undergo heat treatment in the same
furnace or process.
5 Acceptance rules
5.1 Composition of sampling batch
5.1.1 Castings poured from the same furnace of molten iron produced by the same mold
constitute a sampling batch.
5.1.2 The maximum weight of each sampling batch is 2000kg of casting after cleaning.
The sampling batch can be changed upon negotiation between the supplier and the
purchaser.
5.1.5 When continuously melting a large amount of molten iron of the same designation,
the maximum weight of each sampling batch shall not exceed the weight of castings
poured within 2h.
5.2 Sampling for chemical composition
Each sampling batch shall be analyzed once for chemical composition. The analysis
results shall meet the requirements in Table 1.
5.3 Sampling for casting size
The first batch of castings and important castings shall be checked on each piece for
size, geometry and surface roughness. General castings can be spot-checked. The
method of spot check shall be agreed upon by the supplier and the purchaser.
5.6 Evaluation of mechanical performance test results
When testing the tensile strength, if the test result of the first tensile sample fails to meet
the requirements, and it is not caused by the reasons listed in 5.7, then two other
specimens from the same batch can be taken for reinspection.
5.7 Validity of test
If the test result does not meet the requirements due to one of the following reasons
rather than the quality of the casting itself, the test shall be invalid.
5.8 Heat treatment of test blocks and castings
Unless otherwise specified, if the castings are supplied in the as-cast state and their
mechanical properties do not comply with this Standard, with the agreement of the
purchaser, the supplier can conduct heat treatment together with the batch of castings
and its representative test block. Then retest.
6 Marks and quality certificates
6.1 Castings shall have the supplier's mark.
6.2 If there is no specific requirement on the position, size (font size, character height,
convex and concave) and method of the mark, it shall be agreed between the supplier
and the purchaser. However, the mark cannot damage the quality of the casting.
6.3 Castings shall be attached with the quality certificate signed by the supplier's
inspection department. The content of the certificate shall include the following.
7 Rust prevention, packaging and storage
7.1 After the castings pass the inspection, their anti-rust, packaging and storage methods
shall be agreed upon by both parties.
8 Requirements of environmental protection, safety and laws and regulations
The supplier and purchaser shall abide by the environmental protection, safety and laws
and regulations of the relevant countries during the production, acceptance, storage and
transportation process.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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