§ Standards
Status
CURRENT
Last verified
2026-09-06
SAC · STANDARD
GB/T 1591
High Strength Low Alloy Structural Steels
Overview
What this standard covers
Chinese HSLA grades such as Q355, the grade most often compared with S355 on export projects.
Chinese HSLA grades such as Q355, the grade most often compared with S355 on export projects.
Who uses it
Specifiers, buyers and mills confirming what a grade guarantees before it is ordered or substituted.
Details
Reference data
- Standard number
- GB/T 1591
- Title
- High Strength Low Alloy Structural Steels
- Organisation
- SAC
- Country
- China
- Region
- Far East
- Subject
- Materials
- Subcategory
- HSLA
- Type
- STANDARD
- Application
- Contractual
- Availability
- Paid
- Status
- CURRENT
- Roles
- material standard
- Last verified
- 2026-09-06
Official source: sac.gov.cn
Related
Standards used alongside this one
- GB/T 700
Carbon Structural Steels
Chinese carbon structural grades including Q235, defined by yield strength and quality grade letters.
ChinaMaterialsCURRENTPaid
- GB / EN comparison
Comparing GB grades with EN and ASTM grades
Q355 and S355 share a nominal yield strength but differ in quality suffix meaning, impact testing and delivery condition, so certificates must be read rather than assumed.
ChinaSteel grade equivalentsCURRENTFree
- ASTM A36/A36M
Carbon Structural Steel
The long established 36 ksi carbon structural grade, still common for plate, angle and channel.
United StatesMaterialsCURRENTPaid
- ASTM A370
Test Methods and Definitions for Mechanical Testing of Steel Products
How tensile, bend and impact tests on steel products are performed and reported — the basis of the values printed on a US mill certificate.
United StatesMaterialsCURRENTPaid
- ASTM A500/A500M
Cold-Formed Welded and Seamless Carbon Steel Structural Tubing
The usual US HSS specification for round, square and rectangular tubing, with grades B and C in common use.
United StatesMaterialsCURRENTPaid
- ASTM A501/A501M
Hot-Formed Welded and Seamless Carbon Steel Structural Tubing
Hot formed structural tubing, the closest US equivalent to hot finished EN 10210 hollow sections.
United StatesMaterialsCURRENTPaid
Sourcing, review and use
Status
Editorial reference information compiled and maintained by the StructuralSteel.ai team. It is not a design certificate and is not issued under an engineer's seal.
Last reviewed
Calculations
Any figures produced on this page are indicative estimates for early sizing and comparison only — they are not engineered design outputs.
References
Final member selection, loading, connection design, fire design, fabrication and compliance must be verified for your specific project by a suitably qualified structural engineer. Standards are revised; check the edition in force where the work is built.
Verification
StructuralSteel.ai provides technical reference information and links to authoritative sources. Project specifications, applicable legislation, current standards editions and requirements of the responsible engineer or authority should always be verified before fabrication or supply.