This standard specifies the technical requirements, test methods, inspection rules, packaging, storage, transportation, marking and quality certificate of manganese metal. This standard applies to manganese metal produced by electrosilicothermic method, which is used as manganese additive or deoxidizer for smelting high-grade alloy steel and non-ferrous alloy. GB/T 2774-1991 Manganese Metal GB/T2774-1991 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Manganese metal
1 Subject content and scope of application
GB 2774 -- 91
Agency GB 2774:-87
This standard specifies the technical requirements, test methods, inspection rules and packaging, storage, transportation, marking and quality certificate of manganese metal. This standard applies to manganese metal produced by electrosilicon thermal method, which is used for smelting high-grade alloy steel and non-ferrous alloys as manganese element additive or deoxidizer.
2 Reference standards
GB4010
GB4332
GB865f
Sample collection method for chemical analysis of ferroalloys
Sample preparation method for chemical analysis of ferroalloys
Method for chemical analysis of manganese metal
General provisions for acceptance, packaging, storage and transportation, marking and quality certificate of ferroalloys H3660
3 Varieties and technical requirements
3.1 Grades and chemical composition
Metals are divided into six grades according to the manganese and impurity content. Their chemical composition should comply with the requirements in the following table. Chemical warfare analysis%
JMn 95-A
JMn 05-B
JMn 93-A
JMn 93-B
3.2 Physical state
Size
Not less than
Al+ caI Me
Metallic manganese should be in the form of a block. The maximum block weight for delivery should not exceed 10kg. The number of blocks less than 10mml×10mm should not exceed 5% of the total weight.
4 Test method
4. 1 Sampling
Chemical analysis The new sample should be taken in accordance with the provisions of GB4010. 4.2 Sample preparationbzxz.net
Approved by the State Administration of Technical Supervision on March 26, 1991 and implemented on January 1, 1992
GB 2774—91
The sample for chemical analysis shall be prepared in accordance with the provisions of (B4332.4.3 Chemical analysis
The chemical analysis method of metal manganese shall be carried out in accordance with the provisions of GB8654. The analysis methods of nickel, copper, aluminum, calcium and iron shall be negotiated by the supplier and the buyer.5 Inspection rules
5.1 Quality inspection and acceptance
The quality inspection and acceptance of products shall comply with the provisions of GB3650.5.2 Batching
Metal manganese shall be delivered in batches, and each batch shall consist of one or several batches of products of the same brand: the difference in manganese content of each batch of products shall not exceed 2%.
6 Packaging, storage, transportation, marking and 6.1 Packaging
The product is packed in iron, with a net weight of 100kg per barrel. The chemical composition of the product should be listed in the barrel. 6.2 Storage, transportation, marking and quality certificate
The storage, transportation, marking and quality certificate of the product should comply with the provisions of GB3650. Additional remarks:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Zunyi Ferroalloy Factory. The main drafters of this standard are Zhong Xin, Tang Shusheng and Zhou Jiangxiu. In this standard, the grade of FMn97, JMn96, JMn95-AIMn95-4 is marked as \Y\, and the grade of other grades is marked as "\".
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