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Q390B-Q390D hot rolled steel round bars
Q390B-Q390D hot rolled steel round bars
Q390B-Q390D hot rolled steel round bars
Q390B-Q390D hot rolled steel round bars

Q390B-Q390D hot rolled steel round bars

Steel grade Q390B is under steel specification GB/T1591 which is for high strength low alloy structural steels.When customers need special sizes for steel Q390B useage,Xinsteel has the ability to cut and weld in our processing plant for small parts,round plate,seal head and other frames.
Q390B-Q390D hot rolled steel round bars
GB/T1591 Q390 contains five different steel grades as Q390A,Q390B,Q390C,Q390D and Q390E.Structural steel Q390D shall be done impacting test at low temperature minus 20 degree centigrade.Normalised heat treatment suggested to be done for low alloy steel plate Q390D in heavy thickness.
 

Steel Grade:

Q390

Application:

High Speed Steel, Tool Steel

Shape:

Round bar

Standard:

AISI, DIN, JIS, GB

Size:

50mm*50mm-600mm*600MM

Surface:

Black, Peeled, Turned, Grinded

Technique:

Hot rolled, Forged

Ultrasonic Test:

100% UT Passed

 

Dimensions

 

Hot Rolled

Forged

Size(mm)

 

50mm*50mm-600mm*600MM

 

50mm*50mm-600mm*600MM

Length (mm)

6000 or as required

1000-6000

Chemical and Mechanical

Mechnical property for Q390B low alloy structural steel:

Thickness (mm)
Q390B ≤ 16 > 16 ≤ 35 > 35 ≤ 50 >50
Yield strength (≥Mpa) 390 370 350 330
Tensile strength (Mpa) 490-650

Chemical composition for Q390B low alloy structural steel (Heat Analysis Max%)
 
Main chemical elements composition of Q390B
C Si Mn P S V Nb Ti Cr Ni
0.20 0.55 1.00-1.60 0.040 0.040 0.02-0.20 0.015-0.060 0.02-0.20 0.30 0.70

Technical Requirements & Additional Services:
♦ Low temperature impacting test
♦ Cutting and welding as per end user’s demands
♦ More striction on some chemical elements contains
♦ Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
♦ Ultrasonic test under GB/T2970,JB4730,EN 10160,ASTM A435,A577,A578 

FAQ

Q: Are you a manufacturer or merely a trader?

A: We are group of companies and owned manufacturer bases and trading company. We specialized in special steel which include alloy structural steel and carbon steel and stainless steel, etc. All material are with high quality and competitive price.

Q: How do you guarantee the quality of your product?

A: Firstly, we can provide the certificates from the third party, such as TUV, CE, if you need. Secondly, we have a complete set of inspection system and every process is checked by QC. Quality is the lifeline of enterprise survival.

Q: Delivery time?

A: We have ready stock for most of material grades in our warehouse. If the material don’t have stock, the delivery lead time is about 5-30 days after receiving your prepayment or firm order.

Q: What is the payment term?

A: T/T or L/C.

Q: Can you provide a sample for our testing before confirm the order?

A: Yes. We can provide sample to you for approval before you place an order to us. Free sample is available if we have stock.

Q: Can we visit your company and factory?

A: Yes, warmly welcome! We can book the hotel for you before you come to China and arrange our driver to our airport to pick you up when you come.

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