ASTM A437 type B4B datasheet,ASTM A437 type B4B chemical,ASTM A437 type B4B heat treatment
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ASTM A437 type B4B
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Standard specifications for stainless and alloy-steel turbine-type bolting specially heat treated for high temperature service ASTM A437-12 Grade B4B datasheet,ASTM A437-12 type B4B Chemical compositions,ASTM A437-12 Grade B4B mechanical properties from Steelmaking, ESR melting, Hot blooming, UT, Hot forging, Hot rolling, Heat treatment, Straightening, 100% Ultrasonic test, Cold working or Machined. Technical specifications - ASTM A437 -2012.
TECHNICAL DATA SHEET - ASTM A437 Grade B4B

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
Mo (%):   0.90 ~ 1.25
W (%):    0.90 ~ 1.25
V (%):     0.20 ~ 0.30
Al (%):    ≤ 0.05
Ti (%):    ≤ 0.05
MECHANICAL PROPERTIES UNDER ROOM TEMPERATURE
Condition: Quenched 1025 ~ 1050℃, oil cooled
               Tempered 650℃ min., air cooled
Annealed hardness: 321 max.
Tensile strength,σb/≥ MPa: 970
Yield strength, σ0.2/≥ MPa: 720
Elongation, δ ≥(%): 13.0
QT hardness: 352 max.
Impact, AKV: 14J min.
PRODUCT DESCRIPTION
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.

PRODUCT PROFILE
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.
ADVANTAGED STOCK
High alloy and superalloy for turbine blade
ASTM A565 Grade 616/422/S42200, Grade 615/S41800, XM-32/S64152
17-4PH/630/1.4542, 631, 851, 961, WB36, D6-AC, D6A.
1.4980, 1.4922, 1.4923, 1.4935, 1.4938, 1.4913
Forms: Bars, Forge piece, Ring, Strip
Non-magnetic alloy
X40MnCrN19/1.3813, X8CrMnN18-18/1.3816, X40MnCr18/1.3817, N1310
Forms: Bars, Forge piece, Ring, Strip

TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry. pleased to EMAIL (lh.steel@hotmail.com ) our resident team of qualified production engineers.

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