CF10M Body Bolt Nut Material 5

304 with 316

Precautions to prevent stainless steel fasteners from locking.

1. When using stainless steel fasteners, do you always lock the nuts at a fixed speed?

If you are a first-time user or a user who is not familiar with the process of stainless steel products, you should consult your ** supplier about the relevant characteristics of stainless steel. In general, slowing down the rate of locking can greatly reduce (or even avoid) the chance of lockout. Because heat energy often occurs at the time of locking, when the heat energy increases, the chance of locking up will also increase.

When in use, the speed at which the stainless steel fasteners are locked should be slower than the speed at which the carbon steel is locked.

2. Do you lubricate the screws or nuts before locking?

If no, butter, molybdenum disulfide, graphite, mica, or talc can be recommended to lubricate the internal and external tooth lines to reduce lockout. Coating is also an effective form of lubrication. The nut that has been snapped and stopped will be like an additional layer of lubrication between the nut and the screw.

3. Do you choose screws and nuts of the same material grade?

If the answer is yes, it is advisable to use different grades of screws and nuts, such as 304 with 316 and so on. However, it should be noted that the stainless steel selected should still meet its own rust and corrosion resistance.

A351 CF10M belongs to the American Standard cast stainless steel, the implementation standard: ASTM A351 A351M-2018

Molybdenum is added to the composition of A351 CF10M. Like other grades, molybdenum provides enhanced protection against corrosion, pitting of chloride solutions, and strength when placed in high-temperature environments. However, its resistance to high temperatures is also compounded by its titanium content, which makes A351 CF10M immune to precipitation at these temperatures.

In addition, the metal is resistant to acids such as sulfuric acid, hydrochloric acid, and acidic sulfates.

The chemical composition of A351 CF10M is shown in the following figure:

A351 CF10M consumes this material in a variety of industrial and household applications, some of which are as follows:

1. Chemical and petrochemical equipment.

2. Food processing equipment.

3. Laboratory equipment.

4. Mining accessories.

5. Bolts and nuts.

6. Coastal paneling.

7. a heat exchanger.

8. YI therapy equipment.

According to ASTM standard specification and according to NACE MR-0175 standard:

with f304 cf8; F316 CF8M is a valve made of housing material, which should be used:

astm a193 grb8m/a194 gr 8m

B8 A2-80 is a bolt made of 316 material;

CF8 is 304 stainless steel CF8=304

304 casting is called CF8

304 forging is called F304

The numbers 3 and 8 represent the carbon content, which are and respectively.

Corresponding to L (low carbon).

The letter M stands for molybdenum in 316 stainless steel.

In this way, it is easy to distinguish between these four cast steel codes.

Material grade: CF10M

Standard: ASTM A351 A351M Technical Specification for Austenitic and Austenitic Ferritic Cast Iron for Pressure-Bearing Parts.

Country/Region: USA

Steel Group: Cast stainless steel.

Chemical Composition: Carbon C:

Silicon SI:

Manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni:

Molybdenum mo:

Material grade: CF10

Standard: ASTM A351 A351M Technical Specification for Austenitic and Austenitic Ferritic Cast Iron for Pressure-Bearing Parts.

Country/Region: USA

Steel Group: Cast stainless steel.

These should be treated differently, different valves have different configurations, the valve body bonnet is SS316, the bolt has certain requirements, but not all in accordance with this requirement, these standards are set by the enterprise itself, DIN, ANSI, GB, JB have no standards for these.

Pure nonsense, and "recommended answers"?

Who says there are no standards for this? "JB T 5300-1991 General Valve Materials" has long specified the combination of various materials. If it is not according to the standard, it is non-standard.

It is related to the ambient temperature, pressure, medium and other parameters used by the valve.

This one is not so prescribed.

For ordinary valve bodies (pressure Xiaohong below 30 megapascals), you can use Q235 hot-rolled thick plates or forgings. The pressure is higher, and the pressure changes drastically, and the valve block can be made of 45 steel, or 40cr, and it is best to quench and temper it, at least normalizing. There is a key buried anti-rust.

There is a workaround.

Stainless steel bolts, copper bolts or galvanized bolts are used;

The exposed threads are coated with anti-rust paint;

The exposed threads are coated with thick butter and protected with plastic film;

Seal with silicone glass glue.

1. You can use non-embroidered steel. 2, or apply butter (water and sun protection). 3. Everything else is fine...