S131
2026-08-02 09:00:00   Origin：   Remark：0 Click：

TECHNICAL DATA SHEET - S131

Material category: aerospace "S" series alloy steel
HS tariff for Customs: 72284000 / 7228 5000
Technical specification: BS EN 3890-2002, BS EN 2344-2001, BS EN 3146-2001
Typical chemical elements (mass fraction - %)
Carbon, C (％): 0.55 ~ 0.70
Silicon, Si (％): 0.20 ~ 0.50
Manganese, Mn (％): 3.50 ~ 5.50
Phosphorus, P (％): ≤ 0.035
Sulfur, S (％): ≤ 0.025
Chromium, Cr (％): 3.00 ～ 4.00
Nickel, Ni (％): 11.0 ～ 14.0
Molybdenum, Mo (％): ≤ 0.50
Niobium, Nb/Ti (%): - 
Others (％): tungsten, W ≤ 1.00, vanadium, V ≤ 0.25

MECHANICAL PROPERTIES UNDER ROOM TEMP.
Heat treatment condition: + AT 1040 ℃ solution annealed
Tensile strength, Rm ≥ MPa: 620
Yield strength, Rp0.2 ≥ MPa: 300
Elongation, A5 ≥ (%): 35.0
Impact strength, AKU ≥ J:  -
Hardness HBS:  -
Condition: work hardened
Tensile strength, Rm ≥ MPa:  950
Yield strength, Rp0.2 ≥ MPa: 740
Elongation, A5 ≥ (%): 30
Impact strength, AKv ≥ J:    -
Hardness HBS:  -

PRODUCT DESCRIPTION
Type S131 alloy steel is usually produced by AOD / EAF 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 bright in the annealed condition.
Final heat treatment - solution treatment.

PROFILE & DIMENSIONS
Round bar / disc (diameter): 6.0 ~ 850 mm
Square bar / flat bar: 8 ~ 600 mm
Length: random length or based on the customer's special requirement.

Heavy/middle plate: T6 ~ 300 X W20 ~ 1000 X L1000 ~ 6000 mm
Sheet steel via cold rolled: T0.5 ~ 6 X W10 ~ 1000 X L1000 ~ 2000 mm
Steel strip via cold rolled: T0.5 ~ 3 X W5 ~ 200 X L (or in coil form)
Forging piece: stepped shafts, other different shapes based on OEM.

ADVANTAGE & SUPERIOR SERVICE
20+ years focus on special steel manufacturing and processing.
Stock over 60 grades with a competitive price, along with cutting service for specific requirement.
Customizing special material is welcome.
CNC saw cutting.
Marking by stamping or printing.
Third party inspection service.
Export packing / Export documents.
Transport by Track, Sea, Courier (FedEx, UPS, DHL) and Air Cargo.
We closely cooperate with the professional inspection partners to strictly control the quality and improve the quality manage system, and guarantee the goods delivery each time. It is proved that we are worth of trusting and will be the strategic partner of the supplying chains in the special steels field.

TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry or help, pleased to EMAIL (sales@ccsteels.com) our resident team of qualified production engineers.