Import Round Bar Aisi 4140 Steel Pipe — Buy in wholesale FOB from Supplier in China
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Round Bar AISI 4140 Steel Pipe
The product is a round bar made from chromium‑molybdenum alloy steel grade AISI 4140, supplied by Big Co., Ltd. in China. According to the listing the alloy complies with AISI, ASTM, BS, DIN, GB and JIS standards. The bars are offered with an outer‑diameter range of 10 mm to 500 mm and a length between 1 000 mm and 6 000 mm. Surface conditions can be delivered black, peeled, polished or machined, and the heat‑treatment options include annealed or quenched‑and‑tempered conditions.
AISI 4140 is known for tensile strengths around 900‑1080 MPa and a typical hardness of 28‑32 HRC after quenching and tempering, making it suitable for high‑stress components. The alloy’s carbon content usually lies between 0.38 % and 0.44 %, while chromium and molybdenum levels give good wear resistance and toughness. In the oil‑and‑gas sector the material is frequently selected for shafts, drill‑collar elements and fasteners that operate under dynamic loads. The bar can be supplied either hot‑rolled or forged, and the supplier mentions that bundles or loose bundles are common export configurations.
Buyers such as equipment manufacturers, machining shops and offshore service firms often request these bars for custom machining or downstream heat treatment. The listing does not disclose minimum order quantities, pricing or lead times, so interested parties should confirm those details directly with the supplier. Typical packaging includes wooden crates or steel drums, and the supplier can provide ISO or mill certificates upon request.
| Material | Chromium Molybdenum Alloy Steel AISI 4140 |
| Standards | AISI, ASTM, BS, DIN, GB, JIS |
| Outer Diameter (OD) range | 10‑500 mm |
| Length range | 1 000‑6 000 mm |
| Heat‑treatment options | Annealed; Quenched and tempered (Q+T) |
| Surface condition options | Black, peeled, polished, machined |
| Typical tensile strength | typical 900‑1080 MPa |
| Typical hardness after heat treatment | typical 28‑32 HRC |
| Typical carbon content | typical 0.38‑0.44 % |
| Typical application sectors | oil and gas, automotive, heavy machinery |
Big Co., Ltd. is located in the Tongzhou District of Beijing, China, as shown in the supplied address. The supplier is listed with a harbour‑level trust tier, but the response rate and average response time are currently recorded as zero, indicating that no replies have been logged through the platform.
The listing provides detailed technical data for the AISI 4140 round bar but does not disclose MOQ, price, lead‑time or specific logistics arrangements. Prospective importers should request those commercial details directly from the supplier and verify the availability of ISO or mill certificates before placing an order.
AISI 4140 round bar is a chromium molybdenum alloy steel bar widely specified in the oil and gas industry for its high strength and toughness. It is similar to AISI 4130 but with slightly higher carbon content, making it ideal for shafts, fasteners, and drill collar components under high stress. This alloy steel bar meets ASTM and AISI standards and is traded globally in diameters from 12mm to 300mm, commonly supplied in bundles or loose bundles for industrial export and distribution.
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Sourcing Round Bar AISI 4140 Steel Pipe from Big Co., Ltd. - China Import Guide
Before placing an order, verify that the supplier can meet the exact diameter and length specifications required for your project, and request copies of the ISO or mill certificates that attest to chemical composition and mechanical properties. Confirm whether the bar will be delivered annealed, black‑coated or in another surface condition, as this influences downstream processing and inspection criteria.
Logistics for Chinese steel exports typically involve FOB or CIF terms; ask the supplier which Incoterms they support and the expected lead time for the chosen quantity. Payment methods such as T/T, LC or open‑account are common, but the buyer should agree on the preferred method and any required pre‑payment milestones before shipping.
Arrange for a third‑party inspection at the point of origin to check dimensions, surface condition and heat‑treatment records. Request the test report and certificate of compliance before cargo release, and ensure that the documentation includes the correct product grade, standards and any required customs paperwork.
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30 suppliersBuy Round Bar Aisi 4140 Steel in Bulk — Verified Supplier in China
When sourcing Round Bar Aisi 4140 Steel Pipe for your business, securing the right balance of quality and cost is essential. Big Co., Ltd., a verified supplier based in China, offers this product with key specifications including AISI 4140 / ASTM A29 / 42CrMo (Chinese Equivalent), C: 0.38-0.43%, Cr: 0.80-1.10%, Mo: 0.15-0.25%, Mn: 0.75-1.00%, Si: 0.15-0.30%, and Diameter 10mm - 300mm; Length 3m - 6m (or cut-to-length). By purchasing directly from the manufacturer or authorized exporter, buyers can negotiate favorable FOB prices starting at $100/Bags and manage bulk orders with a minimum order quantity (MOQ) of 1 Bags. This product is actively traded under HS Code 7228.70, making it a staple in the Steel Pipes sector with strong demand from importing countries worldwide.
Round Bar Aisi 4140 Steel Specifications, Trade Terms & Pricing
Importing Round Bar Aisi 4140 Steel requires careful attention to shipping logistics, customs compliance, and secure payment terms. Big Co., Ltd. offers flexible shipping options such as Full Container Load (FCL) or Less than Container Load (LCL) via sea freight. To ensure a smooth transaction, buyers should verify import duties for HS Code 7228.70 in their destination country. Common payment methods for international B2B transactions include Letter of Credit (L/C), Telegraphic Transfer (T/T), and Documents against Payment (D/P). All transactions and RFQs are facilitated through EximNext, a leading B2B marketplace designed to make cross-border trade secure and efficient.
About Big Co., Ltd. — Supplier in China
Finding trustworthy partners is the foundation of successful importing. The supplier of this Round Bar Aisi 4140 Steel has been verified on our platform. Whether you are a distributor, wholesaler, or procurement manager, you can request a free quotation, ask for product samples, and finalize your bulk purchase with confidence. EximNext hosts thousands of verified manufacturers and exporters across 200+ countries. Explore similar products in the Steel Pipes category and connect with top-tier exporters on our comprehensive global B2B marketplace. Start your sourcing journey today.
Import Round Bar Aisi 4140 Steel — Shipping, Logistics & Customs
Importing Round Bar Aisi 4140 Steel requires careful attention to shipping logistics, customs compliance, and secure payment terms. Common shipping options include Full Container Load (FCL) or Less than Container Load (LCL) via sea freight. Buyers should verify import duties for HS Code 7228.70 in their destination country. Common payment methods include Letter of Credit (L/C), Telegraphic Transfer (T/T), and Documents against Payment (D/P).
Frequently Asked Questions About Round Bar Aisi 4140 Steel
What is the wholesale price of Round Bar Aisi 4140 Steel Pipe?
The current listed wholesale price for Round Bar Aisi 4140 Steel Pipe from Big Co., Ltd. is $100/Bags on FOB terms from China. Prices may vary depending on order volume, packaging, and destination. For the most accurate bulk quote, send a direct RFQ to Big Co., Ltd. through EximNext.
What is the Minimum Order Quantity (MOQ) for Round Bar Aisi 4140 Steel?
The supplier, Big Co., Ltd., has set a Minimum Order Quantity (MOQ) of 1 Bags for Round Bar Aisi 4140 Steel. For sample requests or smaller trial orders, contact the supplier directly through our platform's inquiry system.
What is the HS Code for Round Bar Aisi 4140 Steel Pipe?
For international shipping and customs clearance, Round Bar Aisi 4140 Steel Pipe is classified under HS Code 7228.70. Buyers should verify their local customs regulations to determine applicable import duties and taxes for this classification.
How can I import Round Bar Aisi 4140 Steel from China?
To import Round Bar Aisi 4140 Steel from China, negotiate shipping terms (FOB, CIF, or EXW) directly with Big Co., Ltd.. Ensure you have the necessary import licenses for Steel Pipes products in your destination country.
Is Big Co., Ltd. a verified supplier?
Yes, Big Co., Ltd. is a verified supplier on EximNext. You can view their complete company profile, business registration details, certifications, and export history before placing a bulk order.
What are the key specifications of Round Bar Aisi 4140 Steel Pipe?
The key specifications for Round Bar Aisi 4140 Steel Pipe supplied by Big Co., Ltd. include AISI 4140 / ASTM A29 / 42CrMo (Chinese Equivalent), C: 0.38-0.43%, Cr: 0.80-1.10%, Mo: 0.15-0.25%, Mn: 0.75-1.00%, Si: 0.15-0.30%, and Diameter 10mm - 300mm; Length 3m - 6m (or cut-to-length). For a complete technical data sheet or Certificate of Analysis (COA), send an inquiry directly to the supplier through EximNext.
What packaging options are available for bulk orders of Round Bar Aisi 4140 Steel?
Big Co., Ltd. offers Round Bar Aisi 4140 Steel with standard export packaging. Custom packaging, private labeling, and OEM/ODM options may also be available for large wholesale orders.
Which countries import Round Bar Aisi 4140 Steel the most?
Round Bar Aisi 4140 Steel is actively imported by buyers worldwide. Request a destination-specific CIF or CFR quote from Big Co., Ltd. through our platform.
What certifications does this Round Bar Aisi 4140 Steel supplier hold?
Big Co., Ltd. maintains international quality certifications. These ensure that the Round Bar Aisi 4140 Steel meets international quality, safety, and regulatory standards required for cross-border trade.
How do I place a bulk order for Round Bar Aisi 4140 Steel Pipe on EximNext?
Click "Request Quotation" on this product page, specify your required quantity, preferred shipping terms, and destination country. Big Co., Ltd. will respond with a detailed wholesale quote including FOB pricing, lead time, and payment options.
What payment methods are accepted?
Common payment methods include Letter of Credit (L/C), Telegraphic Transfer (T/T), Documents against Payment (D/P), and Escrow services. Confirm accepted terms directly with Big Co., Ltd..
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