Basic Info
Model NO.: ASTM A194 2HM
Type: Heavy Hex Nuts
Head Style: Hexagonal
Material: Carbon Steel
Standard: ASTM
Export Markets: USA, Canada, Brazil, U.K., France, Germany, Spain, Italy, Switzerland, Dubai


, Singapore, Malaysia, Japan, Korea.etc.





Additional Info


Trademark: M


Packing: 25kgs+36ctns

Origin: Ningbo, China




Product Description

Grade: ASTM A194 2HM
Size: 1/4"-4"
Material: Carbon steel, alloy steel ,stainless steel
Surfaces: Black, zinc plated, H.D.G. etc.
Packaging: 25kgs per box, 36 boxes per pallet


Scope
1.1 This specification covers a variety of carbon, alloy, and martens tic stainless steel nuts in the size range1⁄4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range1⁄4 in. and M6 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both. Grade substitutions without the purchaser’s permission are not allowed.
1.2 Bars from which the nuts are made shall be hot-wrought. The material may be further processed by center less grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened.
2. Manufacture (Process)
2.1 Stainless steels for all types of Grade 6 and 8 nuts shall be made by one of the following processes:
2.1.1 Electric-furnace (with separate degassing and refining optional),
2.1.2 Vacuum induction furnace, or either of the above followed by electroslag remelting, or consumable-arc remelting.
2.2 The steel producer shall exercise adequate control to eliminate excessive unhomogeneity, nonmetallic, pipe, porosity, and other defects.
2.3 Grades 1 and 2 nuts shall be hot or cold forged, or shall be machined from hot-forged, hot-rolled, or cold-drawn bars.
2.3.1 All Grades 1 and 2 nuts made by cold forging or by machining from cold-drawn bars shall be stress-relief annealed at a temperature of at least 1000°F [538°C].
2.3.2 Grade 1 and 2 nuts made by hot forging or by machining from hot-forged or hot-rolled bars need not be given any stress relief annealing treatment.
2.4 Grades 2H, 2HM, 3, 4, 6, 6F, 7, 7M, and 16 nuts shall be hot- or cold-forged or shall be machined from hot-forged, hot-rolled, or cold-drawn bars and shall be heat treated to meet the required mechanical properties. These grades shall be reheated above the critical range of the steel, quenched in a suitable medium, and then tempered at a temperature not less than the following:

Grade--------------------------------------Minimum Tempering Temperature,℉（℃）
　2H----------------------------------------850 （455）
　2HM--------------------------------------1150（620）
　3 ------------------------------------------1050（565）
　4 -------------------------------------------1100（595）
　6/6F------------------------------------1100（595）
　7/7M------------------------------------1100（595）
　16-------------------------------------------1200（650）


Nuts machined from bar heat treated in accordance with this specification need not be reheat-treated. For Grade 2HM and 7M nuts, a final stress relief shall be done at or above the minimum tempering temperature after all forming, machining, and tapping operations. This final stress relief may be the tempering operation.




2.4.1 Grade 6 and 6F nuts shall be tempered for a minimum of 1h at the temperature.
2.5 Grades 8, 8C, 8M, 8T, 8F, 8P, 8N, 8MN, 8R, 8S, 8LN,8MLN, 8MLCuN, and 9C nuts shall be hot or cold forged, or shall be machined from hot-forged, hot-rolled or cold-drawn bars.

Keywords

Heavy hex nuts；Hex nuts；ASTM A194；2HM；Black Finish Nuts