Heavy machine tool industry traditional enterprise has a leading limitation

There is a clear view that the Chinese government will be a long-term project for wind power generation, large aircraft manufacturing, urban rail transit and other areas, which will lead to a prolonged period of time in the Chinese heavy machine market. In fact, it is precisely based on this understanding that there will be so many former entrants.

But in reality, the cake of the market is not as big as imagined. From last year to this year, the situation of the entire heavy machine tool market is still rather severe. Traditional enterprises still play a leading role in heavy machine tools.

Traditional enterprises have played a leading role in the competition for similar heavy-duty machine tool companies that have sprung up since the financial crisis. Old, heavy-duty machine tool companies have shown calm and calm. While emerging companies are still using low-end products as paving stones to enter the heavy-duty machine tool industry, old leading companies have been fully committed to high-end products, the first set of major special projects, key equipment, and alternative import products, leading these representatives in China. In the research and development of technological products, old leading companies have contributed. At the same time, going abroad to open up the international market, let Chinese machine tools go to the world and demonstrate the strength of Chinese manufacturing has also become the important task of these leading companies.

Thanks to the cultivation of the market and the promotion of relevant national policies, the research and development of heavy-duty machine tools in our country has achieved commendable results in recent years. The demand for heavy machine tools is mainly concentrated in key industrial enterprises such as energy, transportation, shipbuilding, machinery, metallurgy, aerospace, and military. As a result, these heavy machine tool companies are responsible for equipping China's manufacturing industry. They are frequently built in major engineering projects. The meritorious service has become a model for Chinese equipment and equipment.

Although the old companies played a leading role, but China's heavy machine tool companies are still incomplete, although there are advantages but the problem is still a string.

Bolts & Nuts


In Petro and chemical industry for flange connections Stud Bolts and Hex Bolts are used. 


The quantity of bolts for a flange connection will be given by the number of bolt holes in a flange, diameter and length of bolts is dependent of flange type and Pressure Class of flange.

Stud Bolt length are defined in ASME B16.5 standard. The length in inches is equal to the effective thread length measured parallel to the axis, from the first to the first thread without the chamfers (points). First thread is defined as the intersection of the major diameter of the thread with the base of the point.




1)  Standards: 

Based on DIN  & ANSI   & JIS & IFI

and per drwing

2) Material:   carbon steel, alloy steel, stainless steel
3) bolt  Size:  M4-M42,3/8"--7/8"
4) bolt  Surface: Plain,Zinc ,HDG,DAC,Geomet
5) bolt Thread: UNC, UNF, Metric Thread
6) bolt Quality control : ISO 9001
7) bolt Package : Small box ,Poly Bag,Carton+Pallet

Grades of Stud Bolts

Below a table with materials and grades for flanges, thread rods (bolts) and nuts, arranged on design temperature, flanges, thread rods and recommended nuts.

DESIGN
TEMP.
FLANGES GRADE
THREAD RODS
GRADE
NUTS
-195° to 102°C ASTM A182
Gr. F304, F304L, F316,
F316L, F321, F347
A320 Gr.B8 Class2 A194 Gr.8A
-101° to -47°C ASTM A350
Gr.LF3
A320 Gr.L7 A194 Gr.7
-46° to -30°C ASTM A350
Gr.LF2
A320 Gr.L7 A194 Gr.7
-29° to 427°C ASTM A105 A193 Gr.B7 A194 Gr.2H
428° to 537°C ASTM A182
Gr.F11, F22
A193 Gr.B16 A194 Gr.2H
538° to 648°C ASTM A182
Gr.F11, F22
A193 Gr.B8 Class1 A194 Gr.8A
649° to 815°C ASTM A182
Gr. F304H, F316H
A193 Gr.B8 Class1 A194 Gr.8A
DESIGN
TEMP.
FLG'S GRADE
THREAD RODS
GRADE
NUTS




Stud Bolts, Heavy Nuts, Stud Bolts With 2 Nuts, Hex Bolts, 2H HDG Nuts, Galvanized Bolts and Nuts

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