China's Longitudinal Submerged Arc Welded (LSAW) steel pipes can meet various grade standards established by international organizations and industry bodies. Some of the common grade standards that LSAW Steel Pipes produced in China can meet include:

1. API 5L:

API 5L is a widely recognized specification for line pipe that covers seamless and welded steel pipe for pipeline transportation systems in the petroleum and natural gas industries. LSAW steel pipes in China can meet various grades under API 5L, such as API 5L Grade B, X42, X52, X60, X65, X70, X80, etc.

2. ASTM A53:

ASTM A53 is a standard specification for pipe, steel, black and hot-dipped, zinc-coated, welded and seamless. LSAW steel pipes produced in China can meet the requirements of ASTM A53 Grade A or Grade B.

3. ASTM A252:

ASTM A252 is a standard specification for welded and seamless steel pipe piles. LSAW steel pipes manufactured in China can comply with the requirements of ASTM A252 Grade 1, Grade 2, or Grade 3.

4. EN 10219:

EN 10219 is a European standard that specifies the technical delivery conditions for cold-formed welded structural hollow sections of circular, square, or rectangular forms. LSAW steel pipes from China can meet the requirements of EN 10219-1 and EN 10219-2 for various grades.

5. DIN 2458:

DIN 2458 is a standard that specifies the dimensions and technical conditions of welded steel pipes and unalloyed steel pipes suitable for welding or threading. LSAW steel pipes manufactured in China can conform to the requirements of DIN 2458 standard.

6. GB/T 9711:

GB/T 9711 is a Chinese standard for pipeline steel pipe used in the transportation of oil and gas. LSAW steel pipes produced in China can meet various grades specified in GB/T 9711, such as L245, L290, L320, L360, L390, L415, L450, L485, L555, etc.

7. Other Standards:

Additionally, LSAW steel pipes manufactured in China can meet other international standards and specifications based on customer requirements or project specifications, such as JIS G3466, JIS G3457, BS 1387, etc.

LSAW steel pipes produced in China are manufactured to meet a variety of grade standards to cater to the diverse requirements of industries such as oil and gas, construction, infrastructure, and water transportation. Manufacturers ensure that their products comply with the specified standards to guarantee quality, performance, and safety in various applications.

There are several reputable steel pipe manufacturers in China known for producing high-quality Longitudinal Submerged Arc Welded (LSAW) steel pipes that meet international grade standards. Here are some prominent manufacturers that are known for meeting these level standards:

1. Shanghai JiaFang pipe: JiaFang is one of China's largest steel producers, known for manufacturing a wide range of steel products, including LSAW steel pipes that meet international standards like API, ASTM, EN, and GB/T.

2. Hunan Standard Steel Co., Ltd: Hunan Standard Steel is a leading manufacturer and exporter of steel pipes in China, producing LSAW Pipes that conform to various international standards such as API, ASTM, and DIN.

3. Tianjin Pipe (Group) Corporation (TPCO): TPCO is a well-known manufacturer of seamless steel pipes but also produces LSAW steel pipes meeting international standards like API, ASTM, and GB/T.

4. Husteel Group: Husteel is a major manufacturer of steel pipes in China, producing LSAW pipes that comply with standards like API, ASTM, EN, and GB/T for various applications.

5. Jiangsu Yulong Steel Pipe Co., Ltd: Yulong Steel Pipe is a specialist in producing LSAW steel pipes that meet international standards such as API, ASTM, and GB/T, serving industries like oil and gas, construction, and infrastructure.

6. Cangzhou Steel Pipe Group (CSPG): CSPG is a leading manufacturer of steel pipes in China, offering a wide range of LSAW pipes that conform to international standards like API, ASTM, and GB/T.

7. Shanghai Baobo Steel Pipe Co., Ltd: Baobo Steel Pipe is known for producing high-quality LSAW steel pipes meeting various international standards such as API, ASTM, and DIN for applications in different industries.

8. Shengli Oil & Gas Pipe Holdings Limited: Shengli is a specialized manufacturer of LSAW steel pipes for the oil and gas industry, producing pipes that meet standards like API, ASTM, and GB/T.

It is advisable to conduct further research or contact these manufacturers directly to verify their current capabilities and ensure that they meet specific grade standards required for your project or application.