Stainless Steel Valve Balls 304/304L

Overview

304 is a variation of the basic 18-8 grade, Type 302, with a higher chromium and lower carbon content. Lower carbon minimizes chromium carbide precipitation due to welding and its susceptibility to intergranular corrosion. In many instances, it can be used in the ”as-welded“ condition, while Type 302 must be nnealed in order to retain adequate corrosion resistance. Type 304L is an extra low-carbon variation of Type 304 with a 0.03% maximum carbon content that eliminates carbide precipitation due to welding. As a result, this alloy can be used in the ”as-welded“ condition, even in severe corrosive con-ditions. It often eliminates the necessity of annealing weldments except for applications specifying stress relief. It has slightly lower mechanical properties than Type 304.

Composition

Type 304 %

Type 304L %

Carbon

0.08 max.

0.03 max.

Manganese

2.00 max.

2.00 max.

Phosphorus

0.045 max.

0.045 max.

Sulfur

0.030 max.

0.030 max.

Silicon

0.75 max.

0.75 max.

Chromium

18.00 – 20.00

18.00 – 20.00

Nickel

8.00 – 12.00

8.00 – 12.00

Molybdenum

2.00 – 3.00

2.00 – 3.00

Nitrogen

0.10 max.

0.10 max.

Iron

Balance

Balance

Typical Room Temperature Properties

 

UTS
ksi (MPa)

0.2% YS
ksi (MPa)

Elongation
% in 2″
(50.8 mm)

Hardness
Rockwell

Type 304

85.0 (586)

35.0 (241)

55

B80

Type 304L

90 (621)

42.0 (290)

55

B82

Elevated Temperature Properties


CORROSION RESISTANCE

These steels exhibit excellent resistance to a wide range of atmospheric, chemical, textile, petroleum and food industry exposures.
OXIDATION RESISTANCE
The maximum temperature to which Types 304 and 304L can be exposed continuously without appreciable scaling is about 1 650°F (899°C). For intermittent exposure, the maximum exposure temperature is about 1500°F (816°C).
HEAT TREATMENTS
Type 304 is non-hardenable by heat treatment. Annealing: Heat to 1900 – 2050°F(1038 – 1121°C), then cool rapidly. Thin strip sections may be air cooled, but heavy sections should be water quenched to minimize exposure in the carbide precipitation region. Stress Relief Annealing: Cold worked parts should be stress relieved at 750°F (399°C) for 1/2 to 2 hours.

Stainless Steel Valve Balls 304/304L

Size:1/2″~56″
Product Feature:
Material: F304, F316, CF8M, CF8, 1.4301 1.4008,4A …etc. by Forging and centrifugal casting
Roundness ≤0.03mm
Surface roughness=0.4μm
Outside diameter. 1/2″-4″ +-0.03 mm, 6″-12″+-0.05 mm (Outside diameter tolerance)
Inner diameter 1/2″-4″ 0~0.03mm,6″~12″ 0~0.05mm (Inner diameter tolerance)

 

MaterialF304, F316, CF8M, CF8, 1.4301 1.4008,4A …etc. 
Dimension1/2″~56″
Processing of blankForging, centrifugal casting , coil welding
Sample making timeNormally 5days
Lead timeNormally within 30 days
PackageCartons if no special requests
Types of ballFloating ball , trunnion ball ,hollow ball, solid ball, Metal to Metal ball, T-port ball,V-port ball,Special ball,Blank ball
Surface treatmentPolishing, nickel plating (ENP), chromium plating (ECR), tungsten carbide (TCC), chromium carbide (CCC), NI60, NI55 and surfacing nickel-based materials

*Any other sizes available on request according to customer drawings!