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5.556mm 7 32inch AISI440c Stainless Steel Balls for Ballpoint Pens 0.7g

5.556mm 7 32inch AISI440c Stainless Steel Balls for Ballpoint Pens 0.7g

 Manufacturing Description

They show good mechanical characteristics, toughness and corrosion resistance. AISI 304L gives lower carbon content, AISI 302 better mechanical qualities. Balls are offered in the passivated problem.


Stainless metal balls are commonly utilized in bearings, vehicles, bikes, bicycles, family appliances, chemical machinery, textile machinery, meals equipment, mining equipment, instruments, and other fields.

Chemical composition 

Kind %C %Si %Mn %P %S %Cr %Ni %N
302 .a hundred and fifty max one.00 max two.00 max .045 max .030 max 17.00-19.00 8.00-ten.00 .a hundred max
304 .080 max .seventy five max 2.00 max .045 max .030 max 18.00-20.00 eight.00-ten.fifty .one hundred max
304L .030 max .seventy five max two.00 max .045 max .030 max eighteen.00-twenty.00 eight.00-10.fifty .a hundred max

CZPT standards 

ITA United states GER FRA Uk RUS CHN JAP
X10CrNi18-8 302 one.4310 Z11CN18-08 301S21 12KH18N9 1Cr18Ni9 SUS301
X5CrNi18-10 304 1.4301 Z7CN18-09 304S15 08KH18N10 0Cr18Ni9 SUS304
X2CrNi18-9 304L one.4307 Z3CN18-ten 304S11 04KH18N10 00Cr19Ni10 SUS304L

Physical / mechanical / thermal / electric / magnetic properties 

Residence Symbol U.o.M. Sort Notes Values
Density δ [g/cm3] Bodily Area temp. 7.95
Young’s modulus E [GPa] Mechanical two hundred
Particular heat c [J/kg-K] Thermal Place temp. five hundred
Coefficient of linear thermal growth α [ten^-six/ºC] Thermal (ΔT=-100°C) 17.5
Thermal conductivity λ [W/(m·K)] Thermal Place temp. 15.eight
CZPT resistivity ρ [Ω*m*10^-9] CZPT 710
Relative magnetic permeability µ Magnetic Paramagnetic one.571*

CZPT data 

Residence Kind U.o.M. Values U.o.M. Values
Hardness Mechanical [HRC] twenty – 39 (1)* [HV] 100 – 250 (2)*
Supreme tensile toughness Mechanical [MPa] 500 – 1300 [psix10^3] seventy two – 188
Support temperature Thermal [ºC] -196 / seven hundred [ºF] -320.eight / 1697

Corrosion Resistance 
Extremely excellent corrosion resistance with respect to organic substances, oxidating remedies, foodstuff, sterilizing answers. Great resistance with respect to atmospheric corrosion and dyes. They are subjected to pitting and crevice corrosion in presence of sizzling chloride answers and to pressure corrosion when temperature exceeds 60°C. They do not resist to sulfuric acid remedies. AISI 302 demonstrates somewhat greatest corrosion resistance with regard to AISI 304/304L stainless steels.


Property  Description
Hardness* Balls can be supplied in the (1) Cold Worked (HRC twenty-39, regular item) or (2) ANNEALED (HV one hundred-250, on need) problems.
Magnetism Eventual magnetism of AISI 316 balls and in common of all austenitc stainless steels strictly relies upon by the manufacturing procedure, particular inquiries for not magnetic balls must priorly described.
Precision Quality** On specifical request and for huge quantities, we can provide G10 and G16 precision quality balls. Diameters from 3.000 mm to 1/two”.
Precision Grade** On specifical ask for we can provide G20-24-25-28-40-forty eight-fifty-sixty-80 precision grade balls.

Other Merchandise

Packing&Shipping and delivery

Generation Process

Company Info

ZheJiang Jinnai CZPT Trade Co.,Ltd. is 1 of the professional manufactures which specialize in the steel ball,like carbon

steel balls,stainless steel balls ,bearing chrome metal balls ,hollow steel balls ,iron balls ,magnetic buckyballs ,ball connected products

such as ball cage or ball retainers, silicone balls ,plastic balls .ect…



Q:Do you supply samples prior to buy? is it free or extra ?
A: Yes, we could offer you the sample ,But added.or we can go over
Q:Can you do CZPT design ?
A: Of course,we can do customizes layout,you just give us your style,image,structure,dimension and your necessary.
Q:What is your terms of payment ?
A: Payment: thirty% T/T in progress ,harmony prior to cargo.

5.556mm 7 32inch AISI440c Stainless Steel Balls for Ballpoint Pens 0.7g

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