ASTM A387 grade 91
2026-02-23 17:23:00 Origin： Remark：0 Click：
Pressure vessel plate alloy steel chromium-molybdenum steel ASTM A387 grade 91 properties available from stock, hot bloomed, forged, rolled, heat treated
TECHNICAL DATA SHEET - ASTM A387 Grade 91
Material standards: ASTM A387 - 2017
Material category: 9.0Cr - 1.0Mo - 0.22V base alloy steel
Typical chemical cmopositions (mass fraction %)
Carbon, C (％): 0.08 ~ 0.12
Typical chemical cmopositions (mass fraction %)
Carbon, C (％): 0.08 ~ 0.12
Manganese, Mn (％): 0.30 ~ 0.60
Silicon, Si (％): 0.20 ~ 0.50
Silicon, Si (％): 0.20 ~ 0.50
Phosphorus, P (％): ≤ 0.020
Sulfur, S (％): ≤ 0.010
Chromium, Cr (%): 8.00 ~ 9.50
Molybdenum, Mo (%): 0.85 ~ 1.05
Sulfur, S (％): ≤ 0.010
Chromium, Cr (%): 8.00 ~ 9.50
Molybdenum, Mo (%): 0.85 ~ 1.05
Nickel, Ni (%): ≤ 0.40
Vanadium, V (%): 0.18 ~ 0.25
Niobium, Nb (%): 0.06 ~ 0.10
Nitrogen, N (%): 0.030 ~ 0.070
Aluminum, Al (%): ≤ 0.020
Titanium, Ti (%): ≤ 0.01
TYPICAL MECHANICAL PROPERTIES
Tensile strength, Rm ≥ MPa: 585 ~ 760
Yield strength, Rp0.2 / MPa: 415
Elongation, A5 ≥ (％): 18.0
Reduction of area, Z ≥ (％): 45.0
Hardness via heat treatment /HBW: 235 Max.
Reduction of area, Z ≥ (％): 45.0
Hardness via heat treatment /HBW: 235 Max.
PRODUCT DESCRIPTION
The alloy is usually produced by BEF /EAF + VD followed by electroslag refining (ESR) if necessary for special purpose. Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different levels according to the buyers' specific requirements.
Round bar / rod / disc (diameter): 6.0 to 900 mm
Square bar / flat bar: 8 to 600 mm
Length: random length or based on the customer's special requirement.
Heavy/middle plate via hot rolled: T6 ~ 200 X W15 ~ 1500 X L1000 ~ 12000 mm
Forging piece: stepped shafts, and other different shapes based on OEM.
The alloy is usually produced by BEF /EAF + VD followed by electroslag refining (ESR) if necessary for special purpose. Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different levels according to the buyers' specific requirements.
Round bar / rod / disc (diameter): 6.0 to 900 mm
Square bar / flat bar: 8 to 600 mm
Length: random length or based on the customer's special requirement.
Heavy/middle plate via hot rolled: T6 ~ 200 X W15 ~ 1500 X L1000 ~ 12000 mm
Forging piece: stepped shafts, and other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE & SERVICE
If you meet further on any technical Inquiry. pleased to EMAIL our resident team of qualified production engineers.
If you meet further on any technical Inquiry. pleased to EMAIL our resident team of qualified production engineers.
Previous page：S90941
Last page：ASTM A387 type 91
Total list
Monthly rank
- 18S135
- 1611SMnPb30
- 15NF 20NC11
- 14EN35B
- 141.7380
- 14SCr435
- 13ASTM 1526/G15260
- 13635H15 / 635M15 / En351
- 131.7005
- 13AISI 8645H