What are the main applications for AISI 4140 steel?

It is widely used in aerospace, oil and gas, automotive, agricultural, and defense industries for parts like gears, shafts, axles, and spindles.

What is the hardness range for the supplied steel?

The steel is generally supplied in quenched and tempered condition with a hardness of 28-32HRC.

What are the available shapes for the steel bars?

Available shapes include Round, Flat, Block, and Square.

1141 4140 4340 Medium Carbon Steel Round Bar

Name: 1141 4140 4340 Medium Carbon Steel Round Bar
Brand: HUNAN QILU INDUSTRIAL CO., LTD.
SKU: 879988225

Hunan, ChinaHUNAN QILU INDUSTRIAL CO., LTD.

US$700.00-1,100.00

1 Ton

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Type

Alloy Steel Bar

Standard

AISI, ASTM, GB, JIS, DIN, BS

Model NO.

1141 4140 4340 Medium Carbon Steel Round Bar

Technique

Forged

Application

Structural Steel Bar, Engineering Mechanical Steel Bar

Surface Treatment

Black Surface/Turned/Rough Machined/Peeled

Alloy

Special Use

Mold Steel, Free Cutting Steel, Cold Heading Steel, Machining Steel

Length

3-5.8m, or as Per Request

Stock

Available in Stock

Certificate

ISO, ABS, BV, CCS, Dnv, Lr, Gl, Mill Certificate

Quality Inspection

Ut, Chemical Composition, Physical Properties/SGS

Heat Treatment

Annealed/Normalized/Q+T

Smelting Workmanship

Eaf + Lf + Vd

Delivery Condition

Forged/Hot Rolled/Cold Drawn

Shape

Round/Flat/Block/Square

Grain Size

ASTM E112

Non-Metallic Inclusiton

ASTM E45

Ut Standard

Sep 1921-84 D/D

Delivery Time

30-45 Days

Transport Package

Standard Seaworthy Packing

Specification

Dia 16-1200

Trademark

Qilu

Origin

China

HS Code

722830

Production Capacity

500, 000ton/Year

Key features

Wide Standard Compliance: Meets AISI, ASTM, GB, JIS, DIN, and BS international standards.

Customizable Length: Available in 3-5.8m or customized length as per request.

Comprehensive Certifications: Includes ISO, ABS, BV, CCS, Dnv, Lr, Gl, and Mill Certificates.

Advanced Heat Treatment: Options include Annealed, Normalized, Q+T, Quenched, and Tempered.

High Precision Testing: UT, Chemical Composition, Physical Properties, and SGS inspection available.

Diverse Surface Finishes: Offers Black, Turned, Rough Machined, Peeled, Polished, and Milled surfaces.

Large Stock Capacity: Over 20,000 tons of ex-stock available in Wuxi and Dongguan.

Proven Manufacturing Capability: Manufacturer with 11 years export experience and advanced forging equipment.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceFast DeliveryLow MOQ

HUNAN QILU INDUSTRIAL CO., LTD.

Hunan, China

Business Type: Manufacturer/FactoryExport Year: 2008-06-01Nearest Port: SHANGHAI, NINGBO, QINGDAOAverage Response Time: ≤4.52hTerms of Payment: LC, T/T, Western Union, etc.International Commercial Terms(Incoterms): FOB, EXW, CFR, CIF

AI-Powered supplier vetting

SummaryThe supplier is identified as HUNAN QILU INDUSTRIAL CO., LTD., a China-based limited company with conflicting classifications as both a trading company and manufacturer/factory. It has broad steel-related business activities, extensive stated export markets, self-operated import/export rights, and eight years of export experience. Customization, ODM, and OEM capabilities are explicitly reported. However, service-management documentation is absent, including supplier approval, corrective-action, and complaint-handling procedures. No in-stock, overseas warehouse, showroom, agent, or branch capability is reported. Financial records are referenced for 2021–2023, but no substantive financial performance evidence is provided. Production volumes and staffing are stated, although the supplier’s trading-company classification creates uncertainty regarding direct manufacturing capacity. No certifications or customer cases are documented.

After-Sales capabilityThe supplier reports no written procedures or records for service-capability assessment, corrective and preventive actions, or customer-complaint handling. It also reports no in-stock service, overseas warehouse, showroom, agent, or branch capability, although lead times are stated as one month in both peak and off-season periods.

R&D capabilityThe supplier reports total R&D-engineer experience of 6–10 years and offers ODM services, indicating some design and development capability. However, it has no available SDK, and the slices do not provide concrete innovation outputs, patents, or product-development records.

Production capacityThe supplier states production categories covering cold-drawn material, steel round bar, steel plate, and steel pipe, with substantial annual output figures and 11–20 quality-control staff. However, its classification as both trading company and manufacturer/factory is inconsistent, so the extent of directly controlled production capacity requires verification.

Customization capabilityFlexible customization is explicitly reported, together with ODM service availability and OEM service for popular brands. These statements provide direct evidence of customization and outsourced-brand production capability.