GB/T 4188-2017 English PDF

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GB/T 4188-2017: Molybdenum bars and molybdenum rods
Status: Valid

GB/T 4188: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4188-2017	199	Add to Cart	3 days	Molybdenum bars and molybdenum rods	Valid
GB/T 4188-1984	159	Add to Cart	2 days	Molybdenum rods	Obsolete

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Basic data

Standard ID: GB/T 4188-2017 (GB/T4188-2017)
Description (Translated English): Molybdenum bars and molybdenum rods
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: L90
Classification of International Standard: 31.030
Word Count Estimation: 10,130
Date of Issue: 2017-07-31
Date of Implementation: 2018-02-01
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 4188-2017: Molybdenum bars and molybdenum rods

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Molybdenum bars and molybdenum rods ICS 31.030 L90 National Standards of People's Republic of China Replaces GB 4188-1984 and GB 4190-1984 Molybdenum rods and molybdenum rods 2017-07-31 Posted 2018-02-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is GB 4188-1984 "molybdenum rod" and GB 4190-1984 "doped molybdenum strips," the merger revision. And GB 4188-1984 "Molybdenum rod", GB 4190-1984 "doped molybdenum" compared to the main technical changes are as follows. --- Modify the material grades, divided according to the chemical composition of different MoCo, MoLa, MoK, MoY, Mo1, Mo2 a total of 6 cards No. At the same time delete the use of different brands; --- Added molybdenum round bar varieties and requirements; --- Increasing the doping element content range, and modify the chemical composition of the impurity element content requirements; --- Modify the molybdenum rod and molybdenum rod size specifications; --- Modify the requirements and testing methods of straightness of molybdenum rod; --- Modify the molybdenum strip density; --- Modify the molybdenum rod and molybdenum rod surface quality requirements, while increasing the polished molybdenum rod roughness requirements. Please note that some of this document may be patentable. The issuing agencies of this document do not bear the responsibility of identifying these patents. This standard by the People's Republic of China Ministry of Industry and Information Technology (E) proposed and centralized. This standard by Chengdu Hongbo Industrial Co., Ltd., China Electronics Standardization Institute is responsible for drafting. The main drafters of this standard. Wang Jinsong, Liu Yun, Li Jian. This standard replaces the standards previously issued as. --- GB/T 4188-1984; --- GB/T 4190-1984. Molybdenum rods and molybdenum rods

1 Scope

This standard specifies the molybdenum bar and molybdenum rod requirements, test methods, inspection rules, signs, packaging, transportation, storage. This standard applies to the molybdenum strip prepared by powder metallurgy method and the subsequent use of mechanical processing methods (such as forging, rolling, drawing straightening and Polishing and other processing methods) prepared molybdenum rod.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 4196 tungsten, molybdenum strip density determination method GB/T 4197 tungsten, molybdenum and their alloys sintered billet, bar grain size test method GB/T 4325 Methods for chemical analysis of molybdenum

3 requirements

3.1 product classification Product classification methods are as follows. a) According to the chemical composition, molybdenum bars and molybdenum bar grades are divided into MoCo, MoLa, MoK, MoY, Mo1, Mo2; b) According to the different cross-sectional shape, molybdenum strip is divided into molybdenum bar and molybdenum bar. Molybdenum square bar said the method shown in Example 1; molybdenum bar said side See Example 2 Example 1. A MoK molybdenum square of 14 mm in length, 16 mm in width and 400 mm in length is represented by MoK-14x16x400. Example 2. A Mo1 molybdenum rod with a diameter of 15 mm and a length of 500 mm is represented by Mo1-Φ15 × 400. 3.2 chemical composition Different grades of molybdenum molybdenum rod, its chemical composition (mass fraction) should be consistent with the provisions of Table 1. Table 1 % Grade (Molybdenum addition Element) content Add elemental content Co, Mg La2O3 Si, Al, K Y2O3 Other impurities The sum of the elements Each impurity Elemental content MoCo ≥99.95 0.01 ~ 0.20 - - - ≤0.05 ≤0.01 MoLa ≥99.95 - 0.01 ~ 1.0 - - ≤0.05 ≤0.01 MoK ≥99.95 - - 0.01 ~ 0.60 - ≤0.05 ≤0.01 MoY ≥ 99.95 - - - 0.01 ~ 0.70 ≤ 0.05 ≤ 0.01 Mo1 ≥99.95 - - - - ≤0.05 ≤0.01 Mo2 ≥99.90 - - - - ≤0.10 ≤0.01 ......

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