About Big Co., Ltd. - Steel Pipes Supplier in China

China hosts Big Co., Ltd., which lists 18 active products across the steel pipe, steel bar, drilling machine and tool, and general tool categories. The catalogue groups items under HS chapter 7228 for alloy round bars and HS chapter 7304 for alloy pipes, reflecting the standard customs classifications for steel products. Products such as EN/DIN Standard Alloy Round Bar (HS 7228.20) and ASTM A335 Alloy Pipes (HS 7304.59) illustrate the use of both European EN/DIN and American ASTM specifications. Several entries, for example Deephole Drilling, Boring, Honing and Oil Tools, are presented without HS codes, indicating they may be classified under broader tool categories. The supplier’s portfolio therefore spans alloy steel round bars, seamless and welded alloy pipes, and assorted drilling and oil‑related tools.

The listed alloy round bars cover grades such as 42CrMo4, 4140, 4340, 4130 and other chrome‑molybdenum compositions, all recorded under HS 7228.20 or related sub‑headings. Pipe offerings include ASTM A213, A335, A333, A519 and EN10216 alloys, each mapped to HS 7304 sub‑codes (e.g., 7304.51, 7304.59, 7304.31). Carbon‑manganese GB standard pipes and JIS/BS seamless pipes are also cited with HS 7304.19. The inclusion of both metric (e.g., 16Mn) and international standards (e.g., DIN17175) demonstrates a product mix aimed at diverse manufacturing sectors. Overall, the supplier’s inventory reflects a focus on high‑strength alloy steel components commonly used in pressure vessels, power generation, and heavy‑equipment applications.

Product Range and Specialties of Big Co., Ltd.

The catalogue enumerates alloy round bars such as EN/DIN Standard Alloy Round Bar, AST​M/AISI Standard Alloy Round Bar, GB Standard Alloy Round Bar and generic Alloy Round Bars, all classified under HS 7228.20. In the pipe segment, items include ASTM A335, A519, A213, A333, EN10216, DIN17175, GB Standard Alloy Pipes, and JIS/BS Seamless Pipes, largely falling under HS 7304.51‑59 and 7304.31‑19. Typical industry grades for these products are chrome‑molybdenum alloys (e.g., 4140, 4130, 16Mo3) and low‑temperature carbon steel grades (e.g., 1, 6, 8) that meet ASTM, EN, DIN or GB specifications. Buyers usually evaluate mechanical properties such as tensile strength (≈ 800‑1200 MPa for 4140), impact energy (Charpy V‑notch at - 20 °C for low‑temperature pipes), and chemical composition tolerances defined by the relevant standards. Drilling and oil tools are listed without HS codes but are generally supplied as hardened steel components meeting DIN 338 or ISO 8688 tool standards.

In global steel markets, alloy round bars are frequently supplied in 10 kg to 25 kg bundles, while seamless alloy pipes are shipped in 20‑ft or 40‑ft containers with protective wooden crates or steel slings. Commonly required certifications include mill test reports (MTR), EN 10204 3.1 or 3.2 certificates, and compliance with API 5L for pipe applications. For the Chinese export market, manufacturers often hold ISO 9001 quality management certification, though this supplier’s specific certifications are not listed. Buyers typically request documentation confirming compliance with the cited ASTM, EN, DIN or GB standards before finalising orders.

Trade and Export Information - Big Co., Ltd.

China is a major exporter of alloy steel bars and seamless pipes, supplying automotive, oil‑and‑gas, power‑generation and heavy‑machinery sectors in Europe, North America and Southeast Asia. HS chapter 7228 (steel bars) and 7304 (steel pipes) are routinely inspected by customs for compliance with material specifications and may be subject to anti‑dumping duties in certain jurisdictions. Importers generally require ISO 9001 or ISO 14001 certification from the supplier, as well as product‑specific certificates such as API 5L for pipe grades or EN 10204 for bar grades. Packaging for alloy pipes often follows ISO 1496 container standards, using wooden dunnage and corrosion‑resistant coatings, while round bars are typically bundled in shrink‑wrapped pallets. Common Incoterms for Chinese steel exports are FOB Shanghai or CIF Hong Kong, with lead times of 30‑45 days for standard grades and longer for special alloy specifications.

Typical destination regions for these products include the United States (automotive chassis and engine components), Germany and Italy (industrial machinery), the Middle East (oil‑field pipelines), and Brazil (construction steel). Buyers often arrange third‑party inspections under SGS, BV or Intertek to verify material composition and mechanical properties before shipment. Chinese exporters of alloy steel also adhere to the China Compulsory Certification (CCC) regime for certain tool categories, though the catalogue does not specify CCC status for the listed drilling or oil tools.

Sourcing from Big Co., Ltd. - Buyer Guidance

When sourcing alloy round bars from this supplier, request the latest mill test report (MTR) that details chemical analysis, tensile strength, hardness and heat‑treatment condition, matching the EN 10204 3.1 or 3.2 format. For pipe orders, ask for a compliance certificate referencing the exact ASTM, EN or GB standard cited (e.g., ASTM A335, EN 10216) and verify the pipe dimensions, wall thickness and pressure rating against project specifications. Because some items lack HS codes in the catalogue, confirm the correct tariff classification with the supplier before finalising customs paperwork. Verify whether the supplier holds ISO 9001 or other relevant quality system certificates; if not, consider arranging an independent audit or third‑party inspection to ensure conformity.

Samples of alloy bars are usually supplied in 1 kg pieces, while pipe samples may be provided as 6 m lengths for non‑critical grades. Minimum order quantities (MOQ) for standard bars often start at 500 kg, whereas specialty alloy pipes may require a MOQ of one 20‑ft container (approximately 12 tons). Lead times for standard grades are typically 30 days, but extended heat‑treatment or special alloy compositions can add 15‑20 days. Ensure that packaging meets ISO 1496 container standards and that the shipping terms (FOB, CIF) are clearly defined in the purchase contract.

What alloy grades are available for round bars from Big Co., Ltd.?

The round bar list includes chrome‑molybdenum grades such as 42CrMo4, 4140, 4340, 4130 and other alloy steel grades referenced under HS 7228.20. Each grade conforms to the corresponding EN/DIN or ASTM specification indicated in the product description.

Which standards apply to the alloy pipes offered?

Pipe products are described with standards such as ASTM A335, A519, A213, A333, EN 10216, DIN 17175, GB Standard and JIS/BS specifications. The HS codes (7304.51‑59, 7304.31, 7304.19) align with these standards.

How can I obtain material certification for a purchase?

Request an EN 10204 3.1 or 3.2 mill test report that lists chemical composition, mechanical properties and heat‑treatment condition for the exact grade and size ordered.

Are there typical minimum order quantities for these steel products?

Standard alloy round bars usually have an MOQ of 500 kg, while alloy pipe orders often start at one 20‑ft container (≈12 tons) for the listed grades.

What lead time should I expect for a standard alloy pipe order?

For commonly stocked grades, manufacturers in China typically deliver within 30 days after receipt of the purchase order and required documents; special alloys or heat‑treatment can extend the schedule by 15‑20 days.

What packaging and shipping methods are used for the steel items?

Bars are palletised and shrink‑wrapped; pipes are crated or bundled with wooden dunnage and loaded into ISO containers. Common Incoterms are FOB Shanghai or CIF Hong Kong, depending on buyer preference.

Which certifications should I request before placing an order?

Buyers should ask for ISO 9001 quality‑management certification, the relevant ASTM/EN/GB standard certificates, and, for pipe applications, API 5L or EN 10216 compliance documents.

How are the drilling and oil tools classified for customs?

Since the catalogue does not assign HS codes to the Deephole Drilling and Oil Tools entries, they are generally classified under HS 8205 or HS 8467 for hand tools, but the exact code should be confirmed with the supplier prior to export.