Pipe & Tube Steel
Grades behind seamless pipe and tube: carbon, HSLA and alloy steels for hydraulic, structural and pressure service, plus API line pipe and casing grades.
27SiMn
27SiMn is a Chinese Si-Mn alloy steel specified for hydraulic cylinder tubes and coal-mine hydraulic props — high Q&T st…
API 5L Grade B
API 5L Grade B is the entry grade of the pipeline specification — the most common line-pipe steel worldwide for low and …
API 5L X42
API 5L X42 is the first of the X grades — 42 ksi minimum yield — used for moderate-pressure oil and gas pipelines. In th…
API 5L X46
X46 is the step between X42 and X52 in the API 5L line-pipe ladder — less famous than either neighbour, but written into…
API 5L X52
API 5L X52 is one of the highest-volume pipeline grades in service, covering a large share of the world’s gas transmissi…
API 5L X56
X56 fills the gap between the mass-market X52 and the high-strength X60/X65 trunk-line grades. Regional transmission and…
API 5L X60
API 5L X60 is a high-strength line-pipe grade for long-distance, high-pressure gas pipelines, where its 415 MPa yield cu…
API 5L X65
API 5L X65 is the mainstream high-grade line pipe for modern gas transmission, including many of the large-diameter Chin…
API 5L X70
API 5L X70 is the workhorse grade of modern high-pressure, large-diameter gas pipelines — most new trunk lines are desig…
API 5L X80
API 5L X80 is the highest-strength line pipe in routine production, used on flagship projects such as China’s West–East …
API C90 Casing
C90 is a controlled-hardness API 5CT grade for sour (H₂S) wells: quenched-and-tempered to a 90 ksi yield window while th…
API J55 Casing
J55 is the general-purpose API 5CT casing grade for shallow to medium-depth wells with mild service conditions. API 5CT …
API K55 Casing
K55 sits one step above J55 in the API 5CT casing ladder: the same yield window but a higher minimum tensile strength (6…
API L80 13Cr Casing
L80 13Cr is the corrosion-resistant workhorse of the CRA casing family: a true martensitic stainless chemistry written i…
API L80 Casing
L80 is the sour-service-capable API 5CT grade: same 80 ksi class as N80 but with a controlled yield window and a 23 HRC …
API N80 Casing
N80 is the mid-strength API 5CT casing and tubing grade for deeper wells beyond J55/K55 capability. Type Q (Q&T) is pref…
API P110 Casing
P110 is the high-strength API 5CT casing grade for deep, high-pressure wells where collapse and burst loads exceed L80 c…
API Q125 Casing
Q125 is the top standard strength grade in API 5CT: a 125 ksi yield casing for ultra-deep and high-pressure wells where …
API T95 Casing
T95 is the stronger sibling of C90 in the API 5CT sour-service family: 95 ksi yield with the same 25.4 HRC hardness ceil…
P91 / X10CrMoVNb9-1
P91 is the 9Cr-1Mo-V-Nb creep-strength-enhanced ferritic steel that made modern ultra-supercritical power stations possi…
P92 / X10CrWMoVNb9-2
P92 takes the P91 recipe and swaps part of the molybdenum for 1.5–2% tungsten plus a boron addition, buying roughly 30% …
Q345B / 16Mn
Q345B is China’s HSLA structural steel (successor of 16Mn) for welded structures, pressure equipment and seamless pipe —…
S355J2
S355J2 is Europe’s structural HSLA steel (EN 10025-2), the benchmark for welded structures, machinery and pipe where −20…
STKM13A
STKM13A is a JIS G3444 carbon steel tube for machine structural purposes — the 370 MPa class tube Japanese machinery mak…
STPG370
STPG370 is the JIS G3454 carbon steel pipe for pressure service at the 370 MPa tensile level — the Japanese counterpart …
STPG410
STPG410 is the higher-strength JIS G3454 pressure pipe grade, the counterpart class to ASTM A106 Grade B — the most wide…
X20CrMoV11-1 / 1.4922
X20CrMoV11-1 (1.4922) is the 12% chromium martensitic creep steel that carried European steam plant at 540–580 °C for de…
See also the Steel equivalent charts.