ASTM A437 Grade B4B
2019-10-16 15:29:09 Origin： Remark：0 Click：
TYPE OF STEEL: Martensitic stainless steel
OFFICIAL TEST CERTIFICATE: issued by TUV - SGS - BV
Technical standards: ASTM A437 - 2012
CHEMICAL COMPOSITION (WEIGHT %)
C (％): 0.20 ~ 0.25
Si (％): 0.20 ~ 0.50
Mn (％): 0.50 ~ 1.00
P (％)≤: 0.025
S (％)≤: 0.025
Cr (％): 11.0 ~ 12.5
Ni (％): 0.50 ~ 1.00
MECHANICAL PROPERTIES UNDER ROOM TEMPERATURE
Condition: Quenched 1025 ~ 1050℃, oil cooled
Yield strength, σ0.2/≥ MPa: 720
Elongation, δ ≥(％): 13.0
The alloy is usually produced by EAF+LF+AOD / VOD /VIM followed by electroslag refining (ESR) / VAR if necessary for special purpose.
Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different levels according to the buyers' requirements.
Bars are usually supplied black/bright in the annealed condition.
Final heat treatment - quenched and tempered
HEAT TREATMENT PRACTICE
Heat treatment is only suitable for specific grades of stainless steel. When heat treating a stainless the hardening temperatures, including rate of heating, cooling and soaking times will vary due to several factors such as the shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult with the heat treatment provider for whole guidance on heat treatment of stainless steel grades. We are delighted to help to work with you the special heat treatment based on your special requirements.
Round bar (Diameter): 5.50mm to 800mm
Square bar / Flat bar: 3mm to 500mm
Sheet steel via cold rolled: T0.5 - 3.0mm X W600- 1000mm X L1000 - 2000mm
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry. pleased to EMAIL (firstname.lastname@example.org ) our resident team of qualified production engineers.