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ASTM A193 B7 B7M carbon steel Fully Threaded Rod Nuts Stud Bolts
and nuts
Description:
PTFE is by the chemist Roy Planck in 1938 Dr (Roy j. Plunkett) in
the Jackson laboratory of dupont in New Jersey, us surprise [1] :
when he tried to make a new refrigerant chloride fluorocarbon
compounds, four fluorine ethylene polymerization in high pressure
storage container (container wall iron becomes polymerization
catalyst).Dupont in 1941 its patents, and in 1944, in the name of
the "PTFE" registered trademark.Subsequently, dupont in PTFE®
again;Outside of ptfe resin has developed a series of products,
including PTFE.AF (amorphous fluorinated polymer), PTFE;FEP
(fluorinated ethylene propylene resins), PTFE.FFR (fluorine polymer
foam resin), PTFE.NXT (fluorine polymer resin), PTFE;PFA
(perfluorinated alkoxy resin) and so on.
Called the PTFE English Polytetrafluoroetylene, hereinafter
referred to as PTFE, PTFE, F4, etc.Ptfe (Polytetrafluoroethene),
commonly referred to as "non-stick coating" or "material" easy
clean huo;Is a kind of using all the hydrogen atoms in the
fluorinated polyethylene synthetic polymer materials.This material
has the acid alkali resistance, resistance to the characteristics
of various kinds of organic solvent, almost insoluble in all
solvents.At the same time, ptfe has the characteristics of high
temperature resistance, low coefficient of friction of it, so can
make lubrication, and also become the easy clean huo ideal coating
of pipe lining.
ASTM A193 B7 B7M Fluorocarbon coated PTFE Stud Bolts Full
threaded Rod with ASTM A194 2H Heavy Nuts
The method of applying the coating shall ensure that damage through
delayed embrittlement (hydrogen embrittlement) is avoided.
This is particularly important in the case of high tensile
steels of Grades B, C and D with tensile strength > 1000 N/mm².
The application should be carried out in accordance with ASTM B841
and associated standards. The surface shall be treated with
chromate conversion treatment according to ASTM B841 Section
4.
The coating shall be capable of passing the adhesion test specified
in ASTM B571
The PTFE top coat for bolting components shall be Xylan 1070® (or)
equivalent. The selected material shall contain
polytetrafluorethylene together with polyamide
/polyimide ester and colouring pigment and shall be the base
cure type. The selected material shall withstand the temperature
range of -50°C to + 200 °C.
The dry film thickness of the PTFE coating on the bolting component
shall not be less than 25 microns and not greater than 40 microns.
The coating shall be applied in accordance with ASTM D823. The
application of coating shall be applied with a minimum of two (or)
more layers.
The fluorocarbon coating system (PTFE) shall be tested in an ASTM
B117 salt fog chamber for 3000 hours.
A corrosion resistance test for PTFE coat over Zn-Ni plated
stud-bolts shall be carried out in accordance with ASTM B117 (salt
spray test) for the time duration of 3000 hrs (minimum).
| Name: (Maichuan) | ASTM A193 B7 B7M carbon steel Fully Threaded Rod Nuts Stud Bolts and nuts |
| Equal Standard | DIN975 DIN976 ASTM A193 ASTM A320 |
| Nut | A194 2H 2HM heavy nut |
| Standard No | ASTM A193 ASTM A320 |
| Thread Type | UNC, UNF, UNEF, M, BSW, BSF, TR, ACME, NPT TP |
| Material | Alloy Steel(40Cr/35CrMo/4140) |
| Grade | B7 B7M L7 L7M B8 B8M |
| Dimension | Metric size: 6mm-100mm, Inch size: 1/8"-3-1/2". |
| Surface treatment | PTFE, PTFE, Xylan Blue, treatment: Plain, black finished, Zinc plated (Galv), Hot DIP Galvanized, Nickel, phosphate black, DACRO coating, etc. |
| Production Technique | Cold forging, Hot forming, Machining, Heat treatment, Staming, etc |
| Package | with mess |
| Sample | Availble |
Application:
Used for natural gas
engineering,oil engineering, petroleum engineering,
Marine engineering and other large-scale application engineering.
Advantages:
1, not sticky, almost all of the material with PTFE coating
adhesion.Thin film also shows good adhesion performance.
2, heat resistance, PTFE coating has excellent heat resistance and
low temperature resistant properties.Resistant to high temperature
to 300 ℃, short time average between 240 ℃ ~ 240 ℃ can be
continuous use, has significant thermal stability, it can work
under freezing temperature and not brittle, not melt at high
temperature.
3, sliding: PTFE coating has lower friction coefficient.Load when
the sliding friction coefficient changes, but numerical only
between 0.05 to 0.15.
4, wet resistance: non-stick PTFE coating surface of water and oil,
the production operation is also not easy to touch solution, such
as with a small amount of dirt, easy to wipe can be removed.Down
time is short, can save time and improve the work efficiency.
5, the wear resistance: under high load, has excellent wear
resistance.Under certain load, has the dual advantages of wear
resistance and adhesion.
6, corrosion resistance: ptfe is almost not affected by drugs, able
to withstand in addition to molten alkali metals, fluoride medium
and higher than 300 ℃ all the strong acid sodium hydroxide
(including aqua regia), strong oxidizer, reductant, and the role of
various kinds of organic solvent, can protect the parts from the
chemical corrosion of any kind.
