GB/T 9437-2009 PDF EnglishUS$310.00 · In stock · Download in 9 seconds
GB/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 procedure Status: Valid GB/T 9437: Historical versions
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/GBT9437-2009GB 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 ContentsForeword... 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... 271 ScopeThis 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 referencesThe 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 content3 Technical requirements3.1 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 methods4.1 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 rules5.1 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 certificates6.1 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 storage7.1 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 regulationsThe 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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