Can you provide samples or custom sizes?

Yes, we support customization for length (6000-9000mm) and offer various surface treatments and machining services.

What certifications do your products have?

Our products are certified under ISO, ASTM, AISI, GB, JIS, DIN, and BS standards.

Forged Steel Flat Bar (AISI 4140)

Name: Forged Steel Flat Bar (AISI 4140)
Brand: HUNAN QILU INDUSTRIAL CO., LTD.
SKU: 670760162

Hunan, ChinaHUNAN QILU INDUSTRIAL CO., LTD.

US$700.00-1,000.00

3 Pieces

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Type

Steel Plate

Standard

ASTM, AISI, GB, JIS, DIN, BS

Model NO.

AISI 4140

Certification

ISO

Surface Treatment

Black Surface

Technique

Hot Rolled

Application

Ship Plate, Boiler Plate

Special Use

High-strength Steel Plate

Stock

Heat Treatment

Annealed, Qt

Payment Term

30% Tt Deposit, Balance Against Bl Copy

Length

6000-9000

Delivery Date

30 Days

Ut Standard

Sep 1921-84 C/C

Grain Size

ASTM E112

Non-Metallic Inclusiton

ASTM E45

Transport Package

Loose in 20" or 40" Container

Specification

T: 6-500

Trademark

Qilu

Origin

Shangdong, China

Production Capacity

500, 000tons/Year

Key features

High Strength Alloy: AISI 4140 steel offers superior strength and heat treatment capabilities compared to 4130 alloy.

Custom Heat Treatment: Available in Annealed, Quenched, and Tempered states to meet specific mechanical property requirements.

Wide Size Range: Flat bars available in thickness 6mm-500mm and width 20mm-1000mm for diverse applications.

Stock Availability: Over 20,000 tons of forged steel stocked in Wuxi and Dongguan for immediate delivery.

Multiple Standards: Complies with ASTM, AISI, GB, JIS, DIN, and BS standards with equivalent grades listed.

Versatile Applications: Ideal for axles, shafts, bolts, gears, molds, and hydraulic machinery components.

Professional Manufacturing: Manufacturer with 11+ years export experience and advanced forging equipment up to 4500t.

Fast Delivery: Standard delivery time is 30-45 days, with off-season lead time within 15 workdays.

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: ≤1.87hTerms 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.

Product Q&A

Q:What is the difference between AISI 4140 and 4130 steel?

AISI 4140 has a slightly higher carbon content than 4130, providing greater strength and heat treatment capabilities, though it has inferior weldability.

Q:What heat treatment options are available?

We offer Normalized, Annealed, Quenched (QT), and Tempered treatments to adjust mechanical properties like tensile strength and hardness.

Q:What are the standard delivery conditions?

Delivery conditions include Hot Forged, Hot Rolled, Cold Drawn, Annealed, QT, and various surface finishes like Black, Peeled, or Polished.

Q:What are the payment terms?

We accept T/T (30% deposit, balance against B/L copy), L/C, Money Gram, and PayPal.

Q:What is the lead time for orders?

The standard delivery time is 30-45 days. During off-season, lead time is within 15 workdays.