Date Published:May. 10. 2016

Property of Special Material Screws

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Property of Special Material Screws

Mechanical property

Property
 Inconel*
(NCF600)
SNSI		 Pure
molybdenum
SNSM SNFCM		 Hastelloy**C-276
(NW0276)
SNSH-C276		 Hastelloy**C-22
(NW6022)
SNSH-C22		 Monel 400 equiv
(UNS N0400)
SNSMN		 Nickel
(NW2201)
SNSN		 Super Invar
SNSIV		 Phosphor
bronze
(C5191)
SNSP		 Aluminum
Alloy
(A5056)
SNSA
Tensile strength
(N/mm2)		 548 - 695 515 793 786 517 - 620 343 - 411 470 590以上 294
0.2% durability
(N/mm2)		 205 - 352 380 400 365 172 - 345 68 - 166 333 － 245
Extension (%) 35 - 55 15 60 57 35 - 60 40 - 60 43 8 12
Hardness
 65 - 85(HRB) － － 92(HRB) 60 - 80(HRB) 75 - 100(HB) 143(HV) － 98(HB)

Values in chart are for reference only. They are not guaranteed values.


 

Physical property

Property
 Inconel*
(NCF600)
SNSI		 Pure
molybdenum
SNSM SNFCM		 Hastelloy*C-276
(NW0276)
SNSH-C276		 Hastelloy*C-22
(NW6022)
SNSH-C22		 Monel 400 equiv
(UNS N0400)
SNSMN		 Nickel
(NW2201)
SNSN		 Super Invar
SNSIV		 Phosphor bronze
(C5191)
SNSP		 Aluminum
Alloy
(A5056)
SNSA
Specific gravity
 8.42 10.2 8.89 8.61 8.80 8.89 8.15 8.83 2.64
Longitudinal elastic
modulus
(GPa)		 207 327 205 209 179 206 132 105 71.7
Heat thermal
conductivity
(W/(m・K)		 16.7 142 － － 22 79.5 10.47 67 112
Linear expansion
coefficient
(K-1)		 13.4×10-6 5.1×10-6 11.2×10-6 12.4×10-6 14.2×10-6(100℃) 13.4×10-6 0.69×10-6 18×10-6 24.1×10-6
Electric resistivity
(μΩ・m)		 1.0 0.058 1.3 1.2 0.5 0.085 0.77 0.13 0.064

Values in chart are for reference only. They are not guaranteed values.


 

Chemical resistance of Inconel*, Hastelloy** and nickel screws

Chemical name
 Temperature
 Inconel* Hastelloy** Nickel
Dilute sulfuric
acid
 Room temperature
 A AA A
Boiling point
 D A D
Concentrated
sulfuric acid
 Room temperature
 C AA C
Boiling point
 D D D
Dilute
hydrochloric acid
 Room temperature
 B AA A
Boiling point
 D D D
Concentrated
hydrochloric acid
 Room temperature
 D AA D
Boiling point
 D B D
Dilute nitric acid
 Room temperature
 D AA D
Boiling point
 － AA D
Concentrated
nitric acid
 Room temperature
 A AA D
Boiling point
 － D D
Dilute phosphoric
acid
 Room temperature
 AA AA AA
Boiling point
 － AA D
Concentrated
phosphoric acid
 Room temperature
 AA AA AA
Boiling point
 － B D
Sodium hydroxide(weak) Room temperature
 AA － AA
Boiling point
 C － AA
Sodium hydroxide(concentrated) Room temperature
 AA － AA
Boiling point
 C － AA
  • AA ：Highly Excellent
  •  A ：Very Good
  •  B ：Satisfactory
  •  C ：Limit
  •  D ：Not satisfactory

* Inconel is a registered trademark of Special Metals Corporation.
** Hastelloy is a registered trademark of Haynes.

Chemical resistance of ceramic screws

Chemical name
 Temperature
 Time Effect
35% hydrochloric acid Boiling
 30 minutes ◎
70% nitric acid Boiling
 30 minutes ◎
98% sulfuric acid Boiling
 30 minutes ◎
90% phosphoric acid Boiling
 30 minutes 〇
60% hydrofluoric acid 20℃ 24 hours △
10% potassium
hydroxide		 80℃ 7 days ◎
Potassium hydroxide
 500℃ (boiling) 24 hours
 △
Sodium hydroxide
 500℃ (boiling) 24 hours
 〇
Sodium carbonate
 900℃ (boiling) 24 hours
 〇
Sodium sulfate
 1000℃ (boiling) 24 hours
 ◎
Potassium fluoride
 90℃ (boiling) 4 hours
 ×
  • ◎：No erosion confirmed
  • 〇：Minor erosion
  • △：Medium erosion
  • ×：Major erosion

 

  • A test piece was used to acquire the test data.
  • Chemical resistance changes with performance conditions.
    Always carry out tests under performance conditions similar to actual conditions in advance.

Magnetic flux density of phosphor bronze screw

  Phosphor bronze
 SUSXM7(Equivalent to SUS304)
Magnetic flux
density(Ｔ)		 0 5×10-5

Measurement device : F.W.BELL 5080 type gauss (tesla) meter
Measurement condition : DC magnetic field measurement mode Distance between probe and sample 5 mm

Physical Properties

Al2MO3(99.5% Alumina)
Specific Gravity 3.9 - 3.939
Flexural Strength(N/mm2) 360
Volume Resistivity(Ω・m) ＞1012
Thermal Conductivity(W/(m・K)) 32(20℃)
Linear Expansion Coefficient(K-1) 7.2×10-6(40 - 400℃)
Vickers Hardness(GPa) 15.5
Maximum Duty Temperature(℃)(GPa) 1500
  • Values in chart are for reference only. They are not guaranteed values.

Chemical Resistance of Ceramic Screws

Chemical Name Temperature Hour Effect
35% Hydrochloric Acid Boiling 30 minutes ◎
70% Nitric Acid Boiling 30 minutes ◎
98% Sulfuric Acid Boiling 30 minutes ◎
90% Phosphoric Acid Boiling 30 minutes 〇
60% Hydrofluoric Acid 20℃ 24 hours △
10% Potassium Hydroxide 80℃ 7 Days ◎
Potassium Hydroxide 500℃(Boiling) 24 hours △
Sodium Hydroxide 500℃(Boiling) 24 hours 〇
Sodium Carbonate 900℃(Boiling) 24 hours 〇
Sodium Sulfate 1000℃(Boiling) 24 hours ◎
Potassium Fluoride 90℃(Boiling) 4 hours ×
  • ◎：No Corrosion
  • 〇：Slight Corrosion
  • △：Moderate Corrosion
  • ×：Heavy Corrosion

  • When tightening ceramic screws, use a torque driver or torque wrench and do not exceed the torsional torque.The recommended torque is 50% of the torsional torque.
M Torsional Torque (N・m)
M3 0.04
M4 0.05
M5 0.10
M6 0.15
M8 0.30
M10 0.50
  • Values in chart are for reference only. They are not guaranteed values.
  • Heat resistance and chemical resistance change with performance conditions. Always carry out tests under performance conditions similar to actual conditions in advance.
  • Ceramic screws may be damaged by impact. Take care when handling these screws.
  • Also, ceramics screws with special specifications such as ventilation holes, dimensions, shapes, and cleanroom washing are available. Please contact us for details.



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