What is UNS 44004 stainless steel?

UNS 44004 (440C) stainless steel is a kind of high carbon and high chromium Martensite stainless steel. Carbon content is 1.0%, chromium content is 17%.

Scope of application: mainly used for making bearing parts working in corrosive environment and strong oxidizing atmosphere without lubrication. 440C has good dimensional stability at high temperature, so it can also be used as corrosion resistant high temperature bearing steel. In addition, it can also be used to manufacture high quality knives, such as medical scalpels, scissors, nozzles, bearings and so on. The capacity of 440C to bear dynamic load is low.

 UNS S44004 comprehensive description:
S44004 stainless steel with long lasting protection of corrosion resistance is the surface substrate material. It requires no additional system, in order to protect the base metal, the metal itself will continue. Stainless steel products to complete its service life. Due to the raw material is 100% recyclable, have focused on processing. In fact, more than 50% of new stainless steel stainless steel scrap from down, thus completed the full life cycle is used again. So, in the project life cycle is stainless steel, is often the most valuable choice.
 
 
UNS S44004 heat treatment process
1) annealing, 800 -920 degree slow cooling.
2) quenching, 1010 - 1070 degree oil cooling;
3) tempering, 100 -180 degree cold fast..

UNS S44004 scope of application:
Mainly used in the manufacture of the corrosion environment and no lubrication bearing working parts in strong oxidizing atmosphere. S44004 has good temperature resistance; high temperature size so can also be used as corrosion resistant high temperature bearing steel. In addition, can also be used to manufacture high quality tools, such as medical scalpel, scissors,nozzle, bearings, etc. 440 f, is to improve the performance of S44004 steel free cutting steel, used for automatic lathe, as well as ordinary alloy steel by quenching hardening characteristics, thus can be obtained by selecting the brand and heat treatment conditions to wide range of different mechanical properties. SS44004 under dynamic load capacity is low.Stainless steel UNS S44004 can be produced as S44004 stainless steel plates, S44004 stainless steel bar, S44004 stainless steel wire, S44004 stainless steel forging product


Additional information:
I. Related features
Higher hardness and moderate wear resistance, in grinding, its disadvantage is relatively large viscosity, and heating up quickly. It is recommended to use chrome corundum or microcrystalline corundum grinding wheel for grinding.

The annealing temperature of 440C is very low. For heat treatment of tools and bearings, the recommended hardness is HRC57-59. If cryogenic treatment is carried out, the hardness can reach HRC60. Corrosion resistance and toughness are very strong, now more widely used in hand knives and high quality factory tools.

Second, related applications
In the domestic stainless steel grade, 440C has a higher hardness. It is mainly used to manufacture bearing parts working in corrosive environment and strong oxidizing atmosphere without lubrication. 440C can also be used as corrosion resistant high temperature bearing steel because of its good size and temperature.

In addition, it can also be used to manufacture high quality knives, such as medical scalpels, scissors, nozzles, bearings and so on. 440F: improves the cutting performance of 440C steel, used in automatic lathes, Martensite stainless steel and ordinary alloy steel have the same characteristics of hardening through quenching, so by choosing grades and heat treatment conditions to get a wide range of different mechanical properties. The capacity of 440C to bear dynamic load is low.

     

Strip, Coil, Foil, Wire, ASTM A 276
APPLICATIONS
Cutlery
Scissors
DESCRIPTION
Type 440A is a straight chromium martensitic stainless steel which combine the superior wear resistance of high carbon alloys with the excellent corrosion resistance of chromium stainless steels. It is magnetic in both the annealed and hardened conditions. Maximum corrosion resistance is attained only in the fully hardened condition.


CHEMISTRY TYPICAL
Carbon: 0.60-0.75
Manganese: 1.00 max
Phosphorus: 0.04 max
Sulfur: 0.03 max
Silicon: 1.00 max
Chromium: 16.00-18.00
Molybdenum: 0.75 max
Iron: Balance


PHYSICAL PROPERTIES
Density: 0.28 lbs/in3 7.74 g/cm3


Electrical Resistivity: microhm-in (microhm-cm):
68 ° F (20 ° C): 23.7 (60.0)


Specific Heat: BTU/lbl° F (kJ/kg•K):
32 - 212 ° F (0 - 100 °C): 0.11 (0.46)


Thermal Conductivity: BTU/hr/ft2/ft/° F (W/m•K):
At 212 ° F (100 ° C): 14.0 (24.2)


Mean Coefficient of Thermal Expansion: in/in/° F (µm/m•K)
32 - 212 °F (0 - 100 °C): 5.7 x 10·6 (10.2)
32 - 1200 °F (0- 649 °C): 6.8 x 10·6 (12.1)


Modulus of Elasticity: ksi (MPa)
29 x 103 (200 x 103) in tension


Magnetic Permeability: Magnetic


FORMS
Coil - Strip, Foil, Ribbon Wire - Profile, Round, Flat, Square

MECHANICAL PROPERTIES AT ROOM TEMPERATURE ANNEALED TYPICAL
Ultimate Tensile Strength: 100 KSI max (690 MPa max)
Yield Strength (0.2% Offset): 65 KSI max (448) MPa max)
Elongation: 15% min
Hardness: Hv 256 max: gauges: < 0.010 inches Rb 100 max: gauges:> 0.010 inches


TEMPERED
Type 440A can be cold rolled to various tempers. Contact LYMETAL Technical Services for additional information.


ADDITIONAL PROPERTIESCORROSION RESISTANCE
Type 440A provides full corrosion resistance only in the hardened or hardened and stress-relieved conditions. Type 440A has good corrosion resistance to atmosphere, fresh water, foods, alkalies and mild acids.


FINISHES
# 1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
# 2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process.
# 2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA- Bright annealed cold rolled and bright annealed
#CBA- Course bright annealed cold rolled matte finish and bright anneal
#2 - Cold Rolled
# 2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part.
Polished - Various grit finish for specific polish finished requirements.


* Not all finishes are available in all alloys - Contact LYMETAL Sales for more information.


WIRE FINISHES
XC - Extra clean bright annealed or bright annealed and cold rolled Grease - Ultra-bright finish (for decorative applications) Soap - Soap is not removed from tempered wire to act as a lubricant.



COLD FORMING
Type 440A has limited formability in the annealed condition.

HEAT TREATMENT
Hardening: Type 440A can be hardened cold working and by heat treatment. 

If you need product information or price, please fill in your contact information in the form below, we will usually contact you within 12 hours. You could also email me info@lyapm.com to get prompt reply.

1. Stock view

   

2. Processing and Technology for heating processing

Cutting processing      Quenching              Tempering                  Annealing

       

3. Quality testing

1.      Inspection Institution

Shanghai Fuda Testing Technology Group Co., LTD. Nanjing Branch  

Focus on analysis, testing, testing, r & D four service areas. Analysis fields include component analysis, formula analysis, failure analysis, structure analysis, methodology development and validation, raw material quality control/evaluation, consistency evaluation, feature analysis and other directions; The testing field involves physical and chemical properties testing, toxic and harmful substances testing, flame retardant performance testing, reliability testing and other directions; The testing field involves energy spectrum, electron microscope, spectrum, chromatography, mass spectrometry and other directions; The r&d field involves formula development, formula upgrading, formula customisation, cooperative research and development and other directions.

Beijing Zhongke Chemical Technology Research Institute 

It is a chemical technology research institution based on scientific research and testing. They adhere to paying equal attention to basic research and applied research, and combining applied research and technology transformation, developing into a comprehensive research institute characterised by "task-oriented disciplines". Approved by the relevant national departments, the company has become a third-party analysis and testing technology service unit, and has obtained CMA qualification certification. It has carried out research and development and design, analysis and testing, test and verification, generic processing, information and intellectual property services, providing public services for innovation of technology-based enterprises. Supported by the government innovation Fund, the institute has been awarded as a national high-tech enterprise.

   

2.Inspection Machining

     

   Metal composition testing machine                      Computerised Materials Torsion Testing Machine                Metal bar composite rod bending tensile strength testing machine

       3. Material test certificate

     4. Packaging 

    In the steel export activities, we also need to pack the steel to prevent the steel from being scattered in the transportation process. In the hoisting process, it is necessary to lift the steel. So steel is very necessary in the export process. Below is the picture of packaging：

According to the requirements of the state of steel materials, the use of binding, bare, frame, pallet.

Packing standard: according to the following national standard requirements (the parts beyond the requirements will be specified separately)

GB／T191 packaging-pictorial marking for handling of goods

GB／T4857 (all parts) basic test for transport packages

GB／T4879 rustproof packaging

GB／T5048 damp-proof packing

GB／T7350water-proof packing

GB／T8166 Package cushioning design

GB/T4892-1996  Hard straight square transport packaging size series

GB/T13201-91 Cylinder transport package size series

 GB/T16471-1996Design and make the size limit of transport package 

5. Logistic

       

               By SEA                                                     By Air                                                           By Express

1. Company profile

Luoyue Precision Metal established in 2018, is a leading Stockists and global distributor for Metal Raw Materials like Steel/Aluminum/ Stainless steel/Copper/ Nickel Rods, Bars, Plates, Sheets,Pipes, fittings, fasteners, Inconel alloys, Wire and Wire-Mesh to customers from aerospace, automotive, electronics, precision manufacturing, ordnance, marine, shipbuilding, oil & gas, power plant and construction.

The company has a high-precision, high-efficiency modern processing site, CNC machine tools and complete testing and inspection technology, and introduces international advanced technologies.

           2. Certificates. (Business certificate/ISO9001/Trading certificate/SGS/FormE)

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          3. Our customers 

                 Customer visits 

           4. Past Inquiry

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1.Customer Rating

       

FAQ
1. Q: Are you a manufacturer?  
 A:No, we are not manufacturers. We have our own warehouse and our own company. I believe we will be the most suitable supplier for you.  
2. Could we visit your factory?  
 A: Sure, we welcome you to visit the factory , check our production lines and know more about our strength and quality.  
3. Q: Do you have quality control system?  
 A: Yes, we have ISO, BV, SGS certifications and our own quality control laboratory.  
4. Q: Can you arrange the shipment for us?  
 A: Yes, we have designated sea freight and railway freight forwarders with decades of experiences and we get the best  price with earliest vessel and professional service.
5. Q: How long is the delivery time?  
 A: Generally it is 7 days if we have the exact goods in our stock. If not, it will take around 15-20 days to get goods ready for delivery.  
6. Q: Can I get some samples?  
 A: We are glad to provide free samples to you, but we do not offer the freight.  
7. Q: What is your after-sale service?  
 A: We provide after-sale service and offer 100% guarantee on our products.  
8. Q: What is your MOQ?  
 A: 2 Tons  

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