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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
No. 18 Xiangfu Middle Road,Yuhua District, Changsha City
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Grade: AISI 1025
Equivalent Steel: GB 25#, JIS S25C, EN C25/1.0406, BS 070M25
AISI 1025 is a low-to-medium carbon structural steel with a carefully balanced chemistry that delivers dependable mechanical performance across a wide range of engineering applications. Its nominal composition comprises 0.22–0.28% carbon as the primary strengthening element, 0.30–0.60% manganese for enhanced hardenability and deoxidation, and strictly controlled residuals of phosphorus and sulfur, each capped at 0.040% and 0.050% respectively, with the balance being iron.
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1025
Qilu
AISI 1025 Steel is a medium-low carbon steel grade widely used for components that require a practical balance of strength, machinability, ductility, and cost. Also commonly identified as SAE 1025 carbon steel, this grade contains approximately 0.25% carbon, giving it higher strength and hardness than very low-carbon grades while retaining good formability and weldability.
1025 carbon steel is available in various product forms, including 1025 steel round bar, steel bar, square bar, flat bar, plate, and custom-forged components. It can be supplied in hot rolled, cold drawn, forged, annealed, normalized, or other condition depending on the required application and mechanical properties.
Country | USA | Europe | China | British | Japan |
Standard | ASTM A29 | EN10250-2 | GB/T699 | BS970 | JIS G4051 |
Grade | 1025 | C25/1.0406 | 25# | 070M25 | S25C |
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
1025 | 0.22-0.28 | / | 0.30-0.60 | 0.040Max | 0.050Max | / | / | / |
C25/1.0406 | 0.22-0.29 | 0.40Max | 0.40-0.70 | 0.045Max | 0.045Max | 0.40Max | 0.10Max | 0.40Max |
25# | 0.22-0.29 | 0.17-0.37 | 0.50-0.80 | 0.035Max | 0.035Max | 0.25Max | / | 0.30Max |
| S25C | 0.22-0.28 | 0.15-0.35 | 0.30-0.60 | 0.030Max | 0.035Max | / | / | / |
Mechanical properties for C25 open die forgings steel in the normalized and normalized and tempered conditions according to EN10250-2.
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
d≤100 | 440Mpa Min | 230Mpa Min | 23% Min | / | 35J Min | / |
100＜d≤250 | 420Mpa Min | 210Mpa Min | 23% Min | 17% Min | 30J Min | 20J Min |
250＜d≤500 | 400Mpa Min | 190Mpa Min | 23% Min | 17% Min | 25J Min | 15J Min |
500＜d≤1000 | 390Mpa Min | 180Mpa Min | 22% Min | 16% Min | 20J Min | 15J Min |
Mechanical properties for C25 open die forgings steel in the quenched and tempered conditions according to EN10250-2.
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
d≤70 | 450Mpa Min | 270Mpa Min | 25% Min | / | 45J Min | / |
70＜d≤160 | 410Mpa Min | 220Mpa Min | 25% Min | 18% Min | 38J Min | 25J Min |
160＜d≤330 | 390Mpa Min | 210Mpa Min | 24% Min | 16% Min | 33J Min | 20J Min |
Remark: L= Longitudinal Tr = Transverse
Product type | Size range | Length |
Cold drawn bar | Φ3-Φ80mm | 6000-9000mm |
Hot rolled bar | Φ16-Φ310mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:3-200mm; W:1500-2500mm | 2000-5800mm |
Hot Forged block | T: 80-800mm; W: 100-2500mm | 2000-5800mm |
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Hunan Qilu Steel provides AISI 1025 steel in multiple forms (cold drawn bar, hot rolled bar, hot forged bar, hot rolled plate) to meet the processing needs of different industries, with strict control of straightness and dimensional tolerance to ensure assembly precision. Stock sizes are updated daily, with monthly stock of hot rolled/forged bars exceeding 10,000 tons.
AISI 1025 medium carbon steel supports multiple heat‑treatment options to tailor strength, hardness and machinability, relieving manufacturing stress and refining internal grain structure.
Soak at 880‑920°C, then air‑cool. Normalizing refines coarse grains, removes residual stress and improves uniformity. It serves as ideal pre‑heat treatment to boost downstream machinability for forged or hot‑rolled 1025 steel components.
Heat to 860‑900°C for full austenitization, then quench in water. Water rapid cooling increases hardness and strength. Note: heavy sections achieve limited through‑hardening. Quenching creates high internal stress; tempering right after quenching is required to prevent cracking.
Conducted post‑quenching. Hold at 550‑660°C and air cool. It releases quenching stress, lowers brittleness and balances hardness‑toughness. Higher tempering temperature yields better ductility. Quench‑and‑temper cycle delivers balanced mechanical properties for load‑bearing 1025 structural parts.
AISI 1025 carbon steel is widely used across machinery, automotive, hardware and structural sectors.
General mechanical parts: shafts, pins, levers, bolts, nuts and medium‑load gear blanks
Equipment structural frames, brackets and support members
Automotive forgings, chassis accessories and standard fasteners
Machined custom components and non‑standard hardware parts
Raw stock for secondary processing: bars, plates and sheets for further fabrication
When selecting carbon steel, AISI 1025 is often compared with AISI 1018 and AISI 1045.
AISI 1018 contains less carbon and generally offers better ductility and weldability, but its strength and hardness are lower than 1025.
AISI 1025 provides a middle-ground solution, offering somewhat higher strength than 1018 while maintaining relatively good machinability and weldability.
AISI 1045 contains considerably more carbon and can achieve higher strength and hardness through heat treatment, making it more suitable for heavily loaded mechanical components.
Therefore, 1025 steel can be a good choice when the requirements fall between those typically associated with low-carbon 1018 and medium-carbon 1045 steel.
A1: AISI 1025 contains higher carbon content than 1018. It delivers higher tensile strength and hardness, yet its ductility and weldability are slightly lower. 1018 fits more for heavy cold forming, while 1025 is preferred when better strength is needed.
A2: Yes. Its relatively low carbon content provides good weldability compared with many medium- and high-carbon steels. Welding procedures should be selected according to section size, welding method, and service requirements.
A3: 1025 steel is used for shafts, pins, bushings, machine components, automotive parts, agricultural machinery components, fasteners, and other general engineering applications.
A4: Common forms include round bar, square bar, flat bar, steel plate, forged products, and machined components. Availability depends on size, production method, and customer requirements.
For inquiries, custom specifications, or to request a quote for AISI 1025 carbon steel products, please contact us. We are committed to providing high-quality materials backed by responsive customer service and technical expertise.
