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Flapper ValvesTHE WHOLE WORLD IS OUR HOME MARKET
SANDVIK STRIP STEEL FOR COMPRESSOR VALVES OFFERS
STANDARD GRADES
STAINLESS VERSUS CARBON STEEL


THE WHOLE WORLD IS OUR HOME MARKET
Sandvik hardened and tempered strip steel for compressor valves is supplied to quality minded customers around the world. With the entire globe as our home market, we are familiar with the needs of the local industry everywhere, and we have learned to deal with many different requirements - in other words to be a reliable supplier to our customers.



Our customers have one thing in common - they all demand reliability. They expect a compressor valve to go on working without fail over a long period, sometimes in a hostile environment. This has guided our product development towards steels capable of ever better performance. But we are not content just to make strip steel with the right properties - we can also give our customers qualified technical service combined with outstanding delivery performance.

Together we can tackle the technical challenges of today and tomorrow and provide suitable solutions. Many things work better with compressor valve steel from Sandvik.

SANDVIK STRIP STEEL FOR COMPRESSOR VALVES OFFERS:

  • High bending and impact fatigue strength
  • High purity
  • Good flatness and surface finish
  • Good blanking properties
  • Excellent thickness tolerances

The metallurgical processing includes a special refining operation to achieve the high level of cleanliness required for valves. The strip is supplied hardened and tempered in both stainless steel and carbon steel.

STANDARD GRADES

STAINLESS:
Sandvik 7C27Mo2
C = 0.38%; Si = 0.40%; Mn = 0.55%; Cr = 13.5%; Mo = 1.0%

Martensitic chromium steel alloyed with molybdenum, giving better corrosion resistance and higher corrosion fatigue strength than conventional steels of the AISI 420 type.

CARBON:
Sandvik 20C
C = 1.00%; Si = 0.25%; Mn = 0.40%

Valves made from Sandvik strip steel are used in compressors for a wide range of applications, such as
- Refrigeration
- Freezing
- Air conditioning
- Gas processing and transportation
- Heat pumps
- Industrial compressors
- Also for valves in two-stroke engines

STAINLESS VERSUS CARBON STEEL

Steel grade selection is determined by the conditions in which the compressor valves will operate. For most applications the carbon grade Sandvik 20C offers sufficient properties, but in some cases the stainless grade Sandvik 7C27Mo2 is required.

Fatigue load
Sandvik 7C27Mo2 has higher fatigue strength than 20C in tensile, bending and impact stress. The superior properties of the stainless steel are particularly beneficial when the valve is exposed to a combination of high bending and impact loads.

Service Temperature
The mechanical properties of a carbon steel can be affected even by a moderate increase in temperature, and at lower temperatures this type of steel is more brittle than stainless steel. Under such conditions the stainless steel Sandvik 7C27Mo2 is recommended.

Corrosive conditions
Even low amounts of corrosive elements or moist air can have a negative influence on the service life, due to corrosion fatigue. In such circumstances the performance of stainless steel 7C27Mo2 is superior to that of carbon steel.

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