Dual-phase steel (DP steel) is a high-strength steel that has a ferritic–martensitic microstructure. DP steels are produced from low or medium carbon steels that are quenched from a temperature above A1 but below A3 determined from continuous cooling transformation diagram. This results in a microstructure consisting of a soft ferrite matrix containing islands of martensite as the secondary phase (martensite increases the tensile strength). Therefore, the overall behaviour of DP steels is governed by the volume fraction, morphology (size, aspect ratio, interconnectivity, etc.), the grain size and the carbon content.[1] For achieving these microstructures, DP steels typically contain 0.06–0.15 wt.% C and 1.5-3% Mn (the former strengthens the martensite, and the latter causes solid solution strengthening in ferrite, while both stabilize the austenite), Cr & Mo (to retard pearlite or bainite formation), Si (to promote ferrite transformation), V and Nb (for precipitation strengthening and microstructure refinement). The desire to produce high strength steels with formability greater than microalloyed steel led the development of DP steels in the 1970s.

DP steels have high ultimate tensile strength (UTS, enabled by the martensite) combined with low initial yielding stress (provided by the ferrite phase), high early-stage strain hardening and macroscopically homogeneous plastic flow (enabled through the absence of Lüders effects). These features render DP steels ideal materials for automotive-related sheet forming operations.


The steel melt is produced in an oxygen top blowing process in the converter, and undergoes an alloy treatment in the secondary metallurgy phase. The product is aluminium-killed steel, with high tensile strength achieved by the composition with manganese, chromium and silicon.


Their advantages are as follows:


Low yield strength
Low yield to tensile strength ratio (yield strength / tensile strength = 0.5)
High initial strain hardening rates
Good uniform elongation
A high strain rate sensitivity (the faster it is crushed the more energy it absorbs)[4]
Good fatigue resistance
Due to these properties DP steels are often used for automotive body panels, wheels, and bumpers

Description
Dual Phase steels offer a good combination of strength and stampability as a result of their microstructure, in which a hard martensitic or bainitic phase is dispersed in a ductile ferritic matrix. These steels have high strain hardenability. This gives them not only good strain redistribution capability and thus stampability, but also finished part mechanical properties, including yield strength, that are far superior to those of the flat metal. The yield strength of Dual Phase steels is further increased by the paint baking (also called Bake Hardening, BH) process.


This high level of mechanical strength obtained in parts lends these steels excellent fatigue strength and good energy-absorption capacity, making them suitable for use in structural parts and reinforcements. Their strong strain hardening combined with a pronounced bake hardening effect gives them excellent potential for reducing the weight of structural parts and even skin parts, especially in the case of CR290Y490T-GI-E Extragal® or Ultragal®.


Applications
Given their high energy absorption capacity and fatigue strength, cold-rolled Dual Phase Steels are particularly well suited for the manufacture of automotive structural and safety parts such as longitudinal beams, crossmembers and reinforcements.


CR290Y490T-GI-E Extragal® or Ultragal® steel can be used to make visible parts with 20% higher dent resistance than conventional high strength steels, resulting in a potential weight saving of some 15%.



As a result of its mechanical strength, hot-rolled Dual Phase 600 can be used to reduce the weight of structural parts by decreasing their thickness. Relevant automotive applications include:


Wheel webs
Lightweight sections
Strut mounts
Fasteners

Generic name	Max. C (%)	Max. Si (%)	Max. Mn (%)	Max. P (%)	Max. S (%)	Al (%)	Max. Cu (%)	Max. B (%)	Max. Ti + Nb (%)	Max. Cr + Mo (%)
DP450	0.14	0.5	1.8	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1
DP500 / FF280DP	0.14	0.5	1.8	0.05	0.01	0.015 - 1	0.2	0.005	0.15	1
DP600	0.15	0.8	2.5	0.05	0.01	0.010 - 1.5	0.2	0.005	0.15	1.4
DP600Y420	0.15	0.8	2.5	0.05	0.01	0.010 - 1.5	0.2	0.005	0.15	1.4
DP780Y450	0.18	0.8	2.5	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.4
DP780Y450 LCE	0.10	0.8	2.5	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.4
DP780Y500	0.18	0.8	2.5	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.4
DP780Y500 LCE	0.1	0.8	2.5	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.4
DF140T	0.17	0.4	1.7	0.02	0.01	≥ 0.010	0.2	0.005	0.15	1.0
DP980Y600 LCE	0.11	1.0	2.9	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.4
DP980Y700	0.23	1.0	2.9	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.4
DP980Y700 LCE	0.11	1.0	2.9	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.4
DP1180Y800	0.23	1.0	2.9	0.05	0.01	0.015 - 1.0	0.2	0.005	0.15	1.0
DP1180Y900	0.23	1.0	2.9	0.05	0.01	0.15 - 1.0	0.2	0.005	0.15	1.0

If you need product information or price, please fill in your contact information in the form , 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

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. 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)

                  .      

          3. Our customers 

                 Customer visits 

           4. Past Inquiry

                  .     

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.

Customer Feedback:

           Comments

           HOT FAQ:

Q1. Where is your factory ?

A1: Our company’s processing center is located in Shanghai, China.Which is well equipped with kinds of machines, such as laser cutting machine,mirror polishing machine and so on.We can provide a wide range of personalized services according to the customers’ needs.

Q2. What are your company's main products ?

A2: We are professional one-stop meta supplier for Aluminium/ steel/ stainless steel/ copper etc.  

Q3. How do you control quality ?

A3: Mill Test Certification is supplied with shipment, Third Party Inspection is available.

Q4. What are the advantages of your company ?

A4: We have many professionals, technical personnel, more competitive prices and best after-dales service than other stainless steel companies.

Q5. How many coutries you already exported ?

A5: Exported to more than 50 countries mainly from America, Russia, UK, Kuwait, Egypt,Turkey, Jordan, India, etc. We are based in Shanghai, China, start from 2019,sell to Southeast Asia(50.00%),South America(10.00%),North America(5.00%),Eastern Europe(5.00%),Eastern Asia(5.00%),Northern Europe(5.00%),Domestic Market(15.00%),Mid East(10.00%). There are total about 11-50 people in our office.

Q6. Can you provide sample ?

A6: Small samples in store and can provide the samples for free.

Customized samples will take about 5-7days.

Q7Could we visit your factory?  

A7: Sure, we welcome you to visit the factory , check our production lines and know more about our strength and quality.  

Q8: Do you have quality control system?  

A8: Yes, we have ISO, BV, SGS certifications and our own quality control laboratory.  

Q9: Can you arrange the shipment for us?  

A9: 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.

Q10: How long is the delivery time?  

A10: 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.  

Q11: Can I get some samples?  

A11: We are glad to provide free samples to you, but we do not offer the freight.  

Q12: What is your after-sale service?  

A12: We provide after-sale service and offer 100% guarantee on our products.  

Q13: What is your MOQ?  

A13: Depend on the request material, sometimes for customized one have MOQ.

Q14: why should you buy from us not from other suppliers?

Luoyue precision metals (Shanghai) Co., Ltd. is located in Shanghai, China. It is one of the most professional metal material suppliers in China, providing nearly 100 kinds of metal materials, from raw materials to CNC processing

Q15: what services can we provide?

Accepted Delivery Terms: FOB, CFR, CIF, EXW, CIP, DDP, Express Delivery

Accepted Payment Currency:USD,EUR,JPY,CAD,GBP,CNY;

Accepted Payment Type: T/T,L/C,D/P D/A

Language Spoken:English,Chinese,Spanish

Supply Ability

500 Ton/Tons per Month

Packaging & Delivery

Airworthy package. Waterproof cloth, wooden case, craft paper and steel belt packing.

Port: shanghai

Exhibition

Production Workshop

Package & Shipping

Contact us