JB/T 6289-2019 English PDFUS$529.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. JB/T 6289-2019: Internal combustion engines -- Casting aluminium pistons -- Metallographic inspection Status: Valid JB/T 6289: Historical versions
Basic dataStandard ID: JB/T 6289-2019 (JB/T6289-2019)Description (Translated English): Internal combustion engines -- Casting aluminium pistons -- Metallographic inspection Sector / Industry: Mechanical & Machinery Industry Standard (Recommended) Classification of Chinese Standard: J92 Word Count Estimation: 23,256 Date of Issue: 2019-08-02 Date of Implementation: 2020-04-01 Older Standard (superseded by this standard): JB/T 6289-2005 Regulation (derived from): Natural Resources Department Announcement No. 7 of 2019 Issuing agency(ies): Ministry of Industry and Information Technology JB/T 6289-2005
JB
MECHANICAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 92
Record No.. 15603-2005
Replacing JB/T 6289-1992
Internal combustion engines – Casting aluminium
pistons - Metallographic inspection
ISSUED ON. FEBRUARY 14, 2005
IMPLEMENTED ON. AUGUST 1, 2005
Issued by. National Development and Reform Commission of the
People's Republic of China
Table of ContentsForeword ... 3 1 Scope ... 4 2 Technical Requirements ... 4 3 Test methods ... 5 4 Examination criteria ... 7ForewordThis Standard is the revision to JB/T 6289-1992 "Internal combustion engines - Casting aluminium pistons - Metallographic inspection". Compared with JB/T 6289-1992, the main changes of this Standard are as follows. - This Standard specifies the new provisions to microstructure’s sampling sites; - Specifies the specimen size of microstructure; - Correct the individual errors in previous standard; - Make wording edition according to GB/T 1.1-2000’s provisions. This Standard replaces JB/T 6289-1992. This Standard was proposed by China Machinery Industry Federation. This Standard internal combustion engine by the National Standardization Technical Committee. Drafting organizations of this Standard. Shanghai Internal Combustion Engine Research Institute AND Shandong Binzhou Bohai Piston Co., Ltd. Main drafters of this Standard. Li Guoen, Wang Yanliang, Zhang Guohua and Feng Zengjian. The historical versions replaced by this Standard are as follows. - GB 3508-1983, JB/T 6289-1992. Internal combustion engines – Casting aluminium pistons - Metallographic inspectionScopeThis Standard specifies the metallographic-structure’s grade-level, inspection and examination methods for internal combustion engines’ casting eutectic aluminum- silicon alloy pistons AND aluminum-silicon-copper-magnesium (Al-Si-Cu-Mg) alloy pistons. This Standard is applicable to metallographic-structure inspection of internal combustion engines’ casting eutectic aluminum-silicon alloy pistons AND Al-Si-Cu-Mg alloy pistons, which are after heat treatment and of which the cylinder diameter is less than or equal to 200mm. 2 Technical Requirements 2.1 Macrostructure Macrostructure defects refer only to the pinholes and loose in casting aluminum-alloy pistons pinholes and loose, collectively known as holes. 2.1.1 Dispersion holes Examine in accordance with 1st-group pictures (see Pictures 2 to 7). Grade-levels 1 to 4 are deemed as conformance; grade-levels above 4 are deemed as nonconformance. 2.1.2 Concentration holes Examine in accordance with 2nd-group pictures (see Pictures 8 to 13). Grade-levels 1 to 4 are deemed as conformance; grade-levels above 4 are deemed as nonconformance. 2.2 Microstructure 2.2.1 Eutectic aluminum-silicon alloy (sodium-salt modification) It shall be in tiny eutectic-structure of α-solid solution and silicon; eutectic silicon shall be in small-dots and small-strips; there must not exist obvious-metamorphism strip silicon, large-chunk of primary silicon, or coarse α-solid solution; phenomena such as over-burning and cracks are strictly not allowed. Examine in accordance with 3rd-group pictures (see Pictures 14 to 19). Grade-levels 1 to 4 are deemed as conformance; grade-levels above 4 are deemed as nonconformance. 2.2.2 Eutectic aluminum-silicon alloy (phosphorus modification) It shall be in eutectic-structure of tiny primary silicon and α-solid solution; eutectic silicon shall be in short strip; there must not exist obvious-metamorphism strip silicon, large-chunk of primary silicon and severely-concentrated primary silicon; phenomena such as over-burning and cracks are strictly not allowed. Examine in accordance with 4th-group pictures (see Pictures 20 to 25). Grade-levels 1 to 4 are deemed as conformance; grade-levels above 4 are deemed as nonconformance. 2.2.3 Al-Si-Cu-Mg alloy It shall be in tiny α-solid solution; the copper aluminum (Al2Cu) shall be in small-chunks and small-strip; silicon shall be in spotty, small-chunks or small-strips, uniformly distributed; there must not have long-strip of silicon, relatively-more primary silicon and coarse-large α-solid solution. Examine in accordance with 5th-group pictures (see Pictures 26 to 31). Grade-levels 1 to 4 are deemed as conformance; grade-levels above 4 are deemed as nonconformance. 2.2.4 Fishbone iron-phase inclusions Appropriate fishbone iron-phase inclusions that are uniformly distributed are allowed; however, it must not have relatively-more large-chunks or concentratedly-distributed fishbone iron-phase inclusions. Examine in accordance with 6th-group pictures (see Pictures 32 to 37). Grade-levels 1 to 4 are deemed as conformance; grade-levels above 4 are deemed as nonconformance. 2.2.5 Acicular iron-phase inclusions A small amount of acicular iron-phase inclusions that are uniformly distributed are allowed; however, there must not have relatively-more long-acicular iron-phase inclusions. Examine in accordance with 7th-group pictures (see Pictures 32 to 37). Grade-levels 1 to 4 are deemed as conformance; grade-levels above 4 are deemed as nonconformance. 3 Test methods 3.1 Macrostructure inspection method 3.1.1 Sampling sites It shall be at entire cross-section, along piston’s centerline and going through pin-hole’s centerline (see Figure 1). 3.1.2 Etching method 4.1.2 For concentration holes, the examination is shown in the 2nd-group pictures; examination description is shown in Table 2. Table 2 Grade- level Examination description of concentration holes Picture number 1 Holes concentration is very slight Maximum hole diameter ≤ 0.30mm 8 2 Holes concentration is slight Maximum hole diameter ≤ 0.50mm 9 3 Holes concentration is relatively-obvious Maximum hole diameter ≤ 0.80mm 10 4 Holes concentration is obvious Maximum hole diameter ≤ 1.20mm 11 5 Holes concentration is relatively-serious Maximum hole diameter ≤ 2.00mm 12 6 Holes concentration is serious Maximum hole diameter > 2.00mm 13 4.2 Microstructure examination criteria 4.2.1 For eutectic aluminum-silicon alloy (sodium-salt modification), the examination is shown in the 3rd-group pictures; examination description is shown in Table 3. Table 3 Grade- level Examination description of eutectic aluminum-silicon alloy (sodium-salt modification) microstructure (100x magnification) Picture number 1 α-solid solution and eutectic silicon are very tiny, evenly distributed 14 2 α-solid solution is tiny; eutectic silicon is in small-spotty, evenly distributed 15 3 α-solid solution is relatively-tiny; eutectic silicon is in spotty; surrounding of eutectic silicon had occurred metamorphism phenomenon 16 α-solid solution is relatively-large; some eutectic silicon are in short- strip, some are in spotty; there are small amount of small-chunks (side- length ≤ 0.09mm) of primary silicon 5 Eutectic silicon are in long-strip; there is no metamorphism 18 α-solid solution is in coarse; eutectic silicon and Al2Cu gather into chunks, chain-distributed along the grain boundaries; there is over- burning 4.2.3 For Al-Si-Cu-Mg alloy microstructure, the examination is shown in the 5th-group pictures; examination description is shown in Table 5. Table 5 Grade-level Examination description of Al-Si-Cu-Mg alloy microstructure (100x magnification) Picture number 1 α-solid solution is very tiny; Al2Cu and eutectic silicon are in tiny chunks, uniformly distributed 26 2 α-solid solution is tiny; Al2Cu and eutectic silicon are in small chunks, uniformly distributed 27 3 α-solid solution is relatively-small; Al2Cu is in strips, uniformly distributed; there are concentrations of eutectic silicon lumps 28 α-solid solution is slightly-large; Al2Cu is in chunks and intermittent meshes; eutectic silicon is in chunks and coarse- strips; there are individual tiny primary silicon occurred, unevenly distributed α-solid solution is relatively-large; Al2Cu is in large-chunks; eutectic silicon is in strips; there are obvious concentrations of eutectic silicon lumps 6 α-solid solution is coarse-large; Al2Cu is distributed in meshes, unevenly distributed 31 α-solid solution is slightly larger, the copper aluminum (Al2Cu) was massive and intermittent mesh, eutectic silicon blocky and rough strips, with initial individual tiny crystalline silicon occurs. Uneven distribution α-solid solution is large, the copper aluminum (Al2Cu) was a large block of eutectic silicon was strip, there is obviously a total of 30 product groups gather α-coarse solid solution, the copper aluminum (Al2Cu) reticular distribution, uneven distribution ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JB/T 6289-2019_English be delivered?Answer: Upon your order, we will start to translate JB/T 6289-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of JB/T 6289-2019_English with my colleagues?Answer: Yes. The purchased PDF of JB/T 6289-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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